Convert Polish Zloty (PLN) to East Caribbean Dollar (XCD)

1 polish_zloty = 1 polish_zloty

Exchange rates last updated: May 14, 2026 12:00

Conversion Formula for Polish Zloty to East Caribbean Dollar

The formula of conversion of Polish Zloty to East Caribbean Dollar is very simple. To convert Polish Zloty to East Caribbean Dollar, we can use this simple formula:

1 Polish Zloty = 1.3402649301 East Caribbean Dollar

1 East Caribbean Dollar = 0.7461211418 Polish Zloty

One Polish Zloty is equal to 1.3402649301 East Caribbean Dollar. So, we need to multiply the number of Polish Zloty by 1.3402649301 to get the no of East Caribbean Dollar. This formula helps when we need to change the measurements from Polish Zloty to East Caribbean Dollar

Polish Zloty to East Caribbean Dollar Conversion

The conversion of Polish Zloty currency to East Caribbean Dollar currency is very simple. Since, as discussed above, One Polish Zloty is equal to 1.3402649301 East Caribbean Dollar. So, to convert Polish Zloty to East Caribbean Dollar, we must multiply no of Polish Zloty to 1.3402649301. Example:-

Polish Zloty East Caribbean Dollar
0.01 Polish Zloty 0.0134026493 East Caribbean Dollar
0.1 Polish Zloty 0.134026493 East Caribbean Dollar
1 Polish Zloty 1.3402649301 East Caribbean Dollar
2 Polish Zloty 2.6805298601 East Caribbean Dollar
3 Polish Zloty 4.0207947902 East Caribbean Dollar
5 Polish Zloty 6.7013246503 East Caribbean Dollar
10 Polish Zloty 13.4026493007 East Caribbean Dollar
20 Polish Zloty 26.8052986013 East Caribbean Dollar
50 Polish Zloty 67.0132465034 East Caribbean Dollar
100 Polish Zloty 134.0264930067 East Caribbean Dollar
500 Polish Zloty 670.1324650337 East Caribbean Dollar
1,000 Polish Zloty 1,340.2649300673 East Caribbean Dollar

Details for Polish Zloty (PLN) Currency

Introduction : The Polish Zloty (PLN), symbolized as 'zł', is the official currency of Poland and one of the most recognized currencies in Central Europe. It plays a central role in Poland's economy, facilitating transactions across retail, business, government, and international trade. The Zloty is subdivided into 100 groszy and is issued and regulated by the National Bank of Poland. It reflects Poland’s strong financial independence within the European Union, as the country has chosen to retain the Zloty instead of adopting the Euro. The currency is widely used in daily transactions and is available in both coin and banknote forms.

History & Origin : The Polish Zloty has a rich and complex history dating back to the 14th century. The term 'złoty', meaning 'golden', originally referred to gold coins used across Central Europe. The modern form of the Zloty was introduced in 1924 after Poland regained independence following World War I. During times of hyperinflation and economic reforms in the late 20th century, the Zloty underwent redenomination in 1995, where 10,000 old Zloty were converted to 1 new Zloty. Since then, the currency has stabilized and has become a reliable means of transaction, even as Poland joined the European Union in 2004 but retained the Zloty as its national currency.

Current Use : The Polish Zloty is used throughout Poland for all economic activities, including retail purchases, service payments, salaries, and government transactions. It is also used for financial savings and investments. While many EU member states use the Euro, Poland continues to use the Zloty to maintain economic control and protect domestic monetary policy. Foreign exchange services for the Zloty are widely available, and the currency is frequently exchanged in neighboring countries. Digital banking and cashless transactions using the Zloty are becoming increasingly popular, especially in urban areas, reflecting Poland’s rapidly modernizing financial ecosystem.

Details of Poland

Poland, located in Central Europe, is a nation steeped in rich history, cultural heritage, and economic resilience. It shares borders with Germany, Czech Republic, Slovakia, Ukraine, Belarus, Lithuania, and Russia, and has access to the Baltic Sea. With a population of over 38 million, Poland is the fifth most populous member of the European Union and a key player in regional politics and trade.

The country has a diverse landscape that includes picturesque mountains, fertile plains, and bustling cities like Warsaw, Kraków, and Gdańsk. Poland has preserved its identity through centuries of invasions, occupations, and partitions, emerging stronger each time. It boasts a vibrant culture influenced by Western and Eastern traditions, visible in its architecture, literature, music, and cuisine.

Poland transitioned from a communist regime to a market-based economy in the early 1990s and has since become one of the fastest-growing economies in Europe. It has developed strong sectors in manufacturing, services, agriculture, and information technology. The country is a major exporter of machinery, food products, and vehicles.

Education and science are highly valued in Poland, and the nation has produced several Nobel laureates, including Marie Curie. Poland is also known for its historic contributions to Christianity, being predominantly Roman Catholic, and its role in global movements such as the fall of communism, led in part by Polish figures like Pope John Paul II and Lech Wałęsa.

Despite challenges such as political polarization and economic disparities, Poland remains a stable democracy with a growing influence on the European and global stage. Its rich heritage and dynamic society make it a unique blend of tradition and innovation.

Details for East Caribbean Dollar (XCD) Currency

Introduction : The East Caribbean Dollar (XCD), symbolized by $, is the official currency of eight members of the Organisation of Eastern Caribbean States (OECS). These include Antigua and Barbuda, Dominica, Grenada, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, as well as the British overseas territories of Anguilla and Montserrat. Issued and regulated by the Eastern Caribbean Central Bank (ECCB), the XCD plays a vital role in supporting regional economic integration and financial stability. It is pegged to the US dollar, which helps provide predictability in international trade and confidence in monetary policy across the Eastern Caribbean.

History & Origin : The East Caribbean Dollar was introduced in 1965, replacing the British West Indies dollar at par. It was designed to unify the currency systems of multiple Eastern Caribbean nations and territories, fostering economic cooperation following decolonization. In 1983, the Eastern Caribbean Central Bank (ECCB) was established to oversee monetary policy, currency issuance, and financial regulation for the region. The ECCB succeeded the Eastern Caribbean Currency Authority and strengthened the region’s commitment to shared financial governance. Over time, the XCD has maintained a stable exchange rate, particularly through its fixed peg to the US dollar at 2.70 XCD to 1 USD since 1976.

Current Use : The East Caribbean Dollar is used for all transactions across member states of the Eastern Caribbean Currency Union. It is the primary medium of exchange for wages, public sector payments, retail commerce, and banking. Banknotes and coins circulate freely across member nations, allowing seamless cross-border trade and tourism. The fixed exchange rate with the US dollar provides macroeconomic stability, especially crucial for these tourism-dependent economies. The ECCB plays a proactive role in promoting digital payment systems, modern banking practices, and financial literacy. The XCD is integral to regional development, enabling coordinated monetary policy across sovereign and non-sovereign territories.

Details of Eastern Caribbean Currency Union (ECCU)

The Eastern Caribbean Currency Union (ECCU) is a unique monetary alliance comprising eight members: Antigua and Barbuda, Dominica, Grenada, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Anguilla, and Montserrat. These countries and territories form part of the Organisation of Eastern Caribbean States (OECS) and share a common currency—the East Caribbean Dollar (XCD)—and a central monetary authority, the Eastern Caribbean Central Bank (ECCB), headquartered in Basseterre, Saint Kitts and Nevis.

The ECCU region is known for its picturesque island landscapes, crystal-clear waters, and rich cultural heritage. Tourism is a major economic driver, along with agriculture, light manufacturing, and offshore financial services. Despite being small island economies, ECCU members have demonstrated a strong commitment to regional cooperation, which enhances their collective resilience to external economic shocks.

The ECCB not only oversees monetary policy but also plays an active role in promoting fiscal responsibility, economic growth, and financial inclusion. It is among the most stable central banking systems in the Caribbean. Through shared financial governance and policy coordination, member states benefit from a stable currency, controlled inflation, and improved access to international markets.

Each ECCU member maintains political independence but cooperates closely in economic and financial matters. The region’s shared goals include sustainable development, climate resilience, and economic diversification. Many countries within the union have made strides in digital transformation and green energy initiatives, reflecting their adaptability and long-term planning.

With a population that values community, culture, and progress, the ECCU continues to evolve as a model of regional integration. The use of a single currency and centralized banking authority allows for enhanced unity, economic security, and the efficient mobilization of shared resources for the benefit of all member states.

Convert Polish Zloty to Other Currencies

Polish Zloty to United Arab Emirates DirhamUnited Arab Emirates Dirham to Polish Zloty
Polish Zloty to Afghan AfghaniAfghan Afghani to Polish Zloty
Polish Zloty to Albanian LekAlbanian Lek to Polish Zloty
Polish Zloty to Armenian DramArmenian Dram to Polish Zloty
Polish Zloty to Netherlands Antillean GuilderNetherlands Antillean Guilder to Polish Zloty
Polish Zloty to Angolan KwanzaAngolan Kwanza to Polish Zloty
Polish Zloty to Argentine PesoArgentine Peso to Polish Zloty
Polish Zloty to Australian DollarAustralian Dollar to Polish Zloty
Polish Zloty to Aruban FlorinAruban Florin to Polish Zloty
Polish Zloty to Azerbaijani ManatAzerbaijani Manat to Polish Zloty
Polish Zloty to Bosnia Herzegovina Convertible MarkBosnia Herzegovina Convertible Mark to Polish Zloty
Polish Zloty to Barbadian DollarBarbadian Dollar to Polish Zloty
Polish Zloty to Bangladeshi TakaBangladeshi Taka to Polish Zloty
Polish Zloty to Bulgarian LevBulgarian Lev to Polish Zloty
Polish Zloty to Bahraini DinarBahraini Dinar to Polish Zloty
Polish Zloty to Burundian FrancBurundian Franc to Polish Zloty
Polish Zloty to Bermudan DollarBermudan Dollar to Polish Zloty
Polish Zloty to Brunei DollarBrunei Dollar to Polish Zloty
Polish Zloty to Bolivian BolivianoBolivian Boliviano to Polish Zloty
Polish Zloty to Brazilian RealBrazilian Real to Polish Zloty
Polish Zloty to Bahamian DollarBahamian Dollar to Polish Zloty
Polish Zloty to Bhutanese NgultrumBhutanese Ngultrum to Polish Zloty
Polish Zloty to Botswanan PulaBotswanan Pula to Polish Zloty
Polish Zloty to Belarusian RubleBelarusian Ruble to Polish Zloty
Polish Zloty to Belize DollarBelize Dollar to Polish Zloty
Polish Zloty to Canadian DollarCanadian Dollar to Polish Zloty
Polish Zloty to Congolese FrancCongolese Franc to Polish Zloty
Polish Zloty to Swiss FrancSwiss Franc to Polish Zloty
Polish Zloty to Chilean Unit Of Account UfChilean Unit Of Account Uf to Polish Zloty
Polish Zloty to Chilean PesoChilean Peso to Polish Zloty
Polish Zloty to Chinese Yuan OffshoreChinese Yuan Offshore to Polish Zloty
Polish Zloty to Chinese YuanChinese Yuan to Polish Zloty
Polish Zloty to Colombian PesoColombian Peso to Polish Zloty
Polish Zloty to Costa Rican ColonCosta Rican Colon to Polish Zloty
Polish Zloty to Cuban Convertible PesoCuban Convertible Peso to Polish Zloty
Polish Zloty to Cuban PesoCuban Peso to Polish Zloty
Polish Zloty to Cape Verdean EscudoCape Verdean Escudo to Polish Zloty
Polish Zloty to Czech Republic KorunaCzech Republic Koruna to Polish Zloty
Polish Zloty to Djiboutian FrancDjiboutian Franc to Polish Zloty
Polish Zloty to Danish KroneDanish Krone to Polish Zloty
Polish Zloty to Dominican PesoDominican Peso to Polish Zloty
Polish Zloty to Algerian DinarAlgerian Dinar to Polish Zloty
Polish Zloty to Egyptian PoundEgyptian Pound to Polish Zloty
Polish Zloty to Eritrean NakfaEritrean Nakfa to Polish Zloty
Polish Zloty to Ethiopian BirrEthiopian Birr to Polish Zloty
Polish Zloty to EuroEuro to Polish Zloty
Polish Zloty to Fijian DollarFijian Dollar to Polish Zloty
Polish Zloty to Falkland Islands PoundFalkland Islands Pound to Polish Zloty
Polish Zloty to British Pound SterlingBritish Pound Sterling to Polish Zloty
Polish Zloty to Georgian LariGeorgian Lari to Polish Zloty
Polish Zloty to Guernsey PoundGuernsey Pound to Polish Zloty
Polish Zloty to Ghanaian CediGhanaian Cedi to Polish Zloty
Polish Zloty to Gibraltar PoundGibraltar Pound to Polish Zloty
Polish Zloty to Gambian DalasiGambian Dalasi to Polish Zloty
Polish Zloty to Guinean FrancGuinean Franc to Polish Zloty
Polish Zloty to Guatemalan QuetzalGuatemalan Quetzal to Polish Zloty
Polish Zloty to Guyanaese DollarGuyanaese Dollar to Polish Zloty
Polish Zloty to Hong Kong DollarHong Kong Dollar to Polish Zloty
Polish Zloty to Honduran LempiraHonduran Lempira to Polish Zloty
Polish Zloty to Haitian GourdeHaitian Gourde to Polish Zloty
Polish Zloty to Hungarian ForintHungarian Forint to Polish Zloty
Polish Zloty to Indonesian RupiahIndonesian Rupiah to Polish Zloty
Polish Zloty to Israeli New SheqelIsraeli New Sheqel to Polish Zloty
Polish Zloty to Manx PoundManx Pound to Polish Zloty
Polish Zloty to Indian RupeeIndian Rupee to Polish Zloty
Polish Zloty to Iraqi DinarIraqi Dinar to Polish Zloty
Polish Zloty to Iranian RialIranian Rial to Polish Zloty
Polish Zloty to Icelandic KronaIcelandic Krona to Polish Zloty
Polish Zloty to Jersey PoundJersey Pound to Polish Zloty
Polish Zloty to Jamaican DollarJamaican Dollar to Polish Zloty
Polish Zloty to Jordanian DinarJordanian Dinar to Polish Zloty
Polish Zloty to Japanese YenJapanese Yen to Polish Zloty
Polish Zloty to Kenyan ShillingKenyan Shilling to Polish Zloty
Polish Zloty to Kyrgystani SomKyrgystani Som to Polish Zloty
Polish Zloty to Cambodian RielCambodian Riel to Polish Zloty
Polish Zloty to Comorian FrancComorian Franc to Polish Zloty
Polish Zloty to North Korean WonNorth Korean Won to Polish Zloty
Polish Zloty to South Korean WonSouth Korean Won to Polish Zloty
Polish Zloty to Kuwaiti DinarKuwaiti Dinar to Polish Zloty
Polish Zloty to Cayman Islands DollarCayman Islands Dollar to Polish Zloty
Polish Zloty to Kazakhstani TengeKazakhstani Tenge to Polish Zloty
Polish Zloty to Laotian KipLaotian Kip to Polish Zloty
Polish Zloty to Lebanese PoundLebanese Pound to Polish Zloty
Polish Zloty to Sri Lankan RupeeSri Lankan Rupee to Polish Zloty
Polish Zloty to Liberian DollarLiberian Dollar to Polish Zloty
Polish Zloty to Lesotho LotiLesotho Loti to Polish Zloty
Polish Zloty to Libyan DinarLibyan Dinar to Polish Zloty
Polish Zloty to Moroccan DirhamMoroccan Dirham to Polish Zloty
Polish Zloty to Moldovan LeuMoldovan Leu to Polish Zloty
Polish Zloty to Malagasy AriaryMalagasy Ariary to Polish Zloty
Polish Zloty to Macedonian DenarMacedonian Denar to Polish Zloty
Polish Zloty to Myanma KyatMyanma Kyat to Polish Zloty
Polish Zloty to Mongolian TugrikMongolian Tugrik to Polish Zloty
Polish Zloty to Macanese PatacaMacanese Pataca to Polish Zloty
Polish Zloty to Mauritanian OuguiyaMauritanian Ouguiya to Polish Zloty
Polish Zloty to Mauritian RupeeMauritian Rupee to Polish Zloty
Polish Zloty to Maldivian RufiyaaMaldivian Rufiyaa to Polish Zloty
Polish Zloty to Malawian KwachaMalawian Kwacha to Polish Zloty
Polish Zloty to Mexican PesoMexican Peso to Polish Zloty
Polish Zloty to Malaysian RinggitMalaysian Ringgit to Polish Zloty
Polish Zloty to Mozambican MeticalMozambican Metical to Polish Zloty
Polish Zloty to Namibian DollarNamibian Dollar to Polish Zloty
Polish Zloty to Nigerian NairaNigerian Naira to Polish Zloty
Polish Zloty to Nicaraguan CordobaNicaraguan Cordoba to Polish Zloty
Polish Zloty to Norwegian KroneNorwegian Krone to Polish Zloty
Polish Zloty to Nepalese RupeeNepalese Rupee to Polish Zloty
Polish Zloty to New Zealand DollarNew Zealand Dollar to Polish Zloty
Polish Zloty to Omani RialOmani Rial to Polish Zloty
Polish Zloty to Panamanian BalboaPanamanian Balboa to Polish Zloty
Polish Zloty to Peruvian Nuevo SolPeruvian Nuevo Sol to Polish Zloty
Polish Zloty to Papua New Guinean KinaPapua New Guinean Kina to Polish Zloty
Polish Zloty to Philippine PesoPhilippine Peso to Polish Zloty
Polish Zloty to Pakistani RupeePakistani Rupee to Polish Zloty
Polish Zloty to Paraguayan GuaraniParaguayan Guarani to Polish Zloty
Polish Zloty to Qatari RialQatari Rial to Polish Zloty
Polish Zloty to Romanian LeuRomanian Leu to Polish Zloty
Polish Zloty to Serbian DinarSerbian Dinar to Polish Zloty
Polish Zloty to Russian RubleRussian Ruble to Polish Zloty
Polish Zloty to Rwandan FrancRwandan Franc to Polish Zloty
Polish Zloty to Saudi RiyalSaudi Riyal to Polish Zloty
Polish Zloty to Solomon Islands DollarSolomon Islands Dollar to Polish Zloty
Polish Zloty to Seychellois RupeeSeychellois Rupee to Polish Zloty
Polish Zloty to Sudanese PoundSudanese Pound to Polish Zloty
Polish Zloty to Swedish KronaSwedish Krona to Polish Zloty
Polish Zloty to Singapore DollarSingapore Dollar to Polish Zloty
Polish Zloty to Saint Helena PoundSaint Helena Pound to Polish Zloty
Polish Zloty to Sierra Leonean LeoneSierra Leonean Leone to Polish Zloty
Polish Zloty to Somali ShillingSomali Shilling to Polish Zloty
Polish Zloty to Surinamese DollarSurinamese Dollar to Polish Zloty
Polish Zloty to South Sudanese PoundSouth Sudanese Pound to Polish Zloty
Polish Zloty to Sao Tome And Principe DobraSao Tome And Principe Dobra to Polish Zloty
Polish Zloty to Salvadoran ColonSalvadoran Colon to Polish Zloty
Polish Zloty to Syrian PoundSyrian Pound to Polish Zloty
Polish Zloty to Swazi LilangeniSwazi Lilangeni to Polish Zloty
Polish Zloty to Thai BahtThai Baht to Polish Zloty
Polish Zloty to Tajikistani SomoniTajikistani Somoni to Polish Zloty
Polish Zloty to Turkmenistani ManatTurkmenistani Manat to Polish Zloty
Polish Zloty to Tunisian DinarTunisian Dinar to Polish Zloty
Polish Zloty to Tongan PaangaTongan Paanga to Polish Zloty
Polish Zloty to Turkish LiraTurkish Lira to Polish Zloty
Polish Zloty to Trinidad And Tobago DollarTrinidad And Tobago Dollar to Polish Zloty
Polish Zloty to New Taiwan DollarNew Taiwan Dollar to Polish Zloty
Polish Zloty to Tanzanian ShillingTanzanian Shilling to Polish Zloty
Polish Zloty to Ukrainian HryvniaUkrainian Hryvnia to Polish Zloty
Polish Zloty to Ugandan ShillingUgandan Shilling to Polish Zloty
Polish Zloty to United States DollarUnited States Dollar to Polish Zloty
Polish Zloty to Uruguayan PesoUruguayan Peso to Polish Zloty
Polish Zloty to Uzbekistan SomUzbekistan Som to Polish Zloty
Polish Zloty to Venezuelan Bolivar SoberanoVenezuelan Bolivar Soberano to Polish Zloty
Polish Zloty to Vietnamese DongVietnamese Dong to Polish Zloty
Polish Zloty to Vanuatu VatuVanuatu Vatu to Polish Zloty
Polish Zloty to Samoan TalaSamoan Tala to Polish Zloty
Polish Zloty to Cfa Franc BeacCfa Franc Beac to Polish Zloty
Polish Zloty to Silver Troy OunceSilver Troy Ounce to Polish Zloty
Polish Zloty to Gold Troy OunceGold Troy Ounce to Polish Zloty
Polish Zloty to East Caribbean DollarEast Caribbean Dollar to Polish Zloty
Polish Zloty to Special Drawing RightsSpecial Drawing Rights to Polish Zloty
Polish Zloty to Cfa Franc BceaoCfa Franc Bceao to Polish Zloty
Polish Zloty to Palladium OuncePalladium Ounce to Polish Zloty
Polish Zloty to Cfp FrancCfp Franc to Polish Zloty
Polish Zloty to Platinum OuncePlatinum Ounce to Polish Zloty
Polish Zloty to Yemeni RialYemeni Rial to Polish Zloty
Polish Zloty to South African RandSouth African Rand to Polish Zloty
Polish Zloty to Zambian KwachaZambian Kwacha to Polish Zloty

FAQ on Polish Zloty (PLN) to East Caribbean Dollar (XCD) Conversion:

What is the Symbol of Polish Zloty and East Caribbean Dollar?

The symbol for Polish Zloty is 'zł', and for East Caribbean Dollars, it is '$'. These symbols are used to denote in everyday currency analysis.

How to convert Polish Zloty(s) to East Caribbean Dollar(es)?

To convert Polish Zloty(s) to East Caribbean Dollar(es), multiply the number of Polish Zlotys by 1.3402649300673 because one Polish Zloty equals 1.3402649300673 East Caribbean Dollars.
Formula: East Caribbean Dollars = Polish Zlotys × 1.3402649300673.
This is a standard rule used in conversions.

How to convert East Caribbean Dollar(es) to Polish Zloty(s) ?

To convert East Caribbean Dollar(es) to Polish Zloty(s), divide the number of East Caribbean Dollars by 1.3402649300673, since, 1 Polish Zloty contains exactly 1.3402649300673 East Caribbean Dollar(es).
Formula: Polish Zlotys = East Caribbean Dollar(s) ÷ 1.3402649300673.
It’s a common calculation in conversions.

How many Polish Zloty(s) are these in an East Caribbean Dollar(es) ?

There are 0.7461211418475 Polish Zlotys in one East Caribbean Dollar. This is derived by dividing 1 East Caribbean Dollar by 1.3402649300673, as 1 Polish Zloty equals 1.3402649300673 East Caribbean Dollar(s).
Formula: Polish Zloty = East Caribbean Dollars ÷ 1.3402649300673.
It’s a precise currency conversion method.

How many East Caribbean Dollar(es) are these in an Polish Zloty(s) ?

There are exactly 1.3402649300673 East Caribbean Dollars in one Polish Zloty. This is a fixed value used in the measurement system.
Formula: East Caribbean Dollar(s) = Polish Zlotys × 1.3402649300673.
It's one of the most basic conversions.

How many East Caribbean Dollar in 10 Polish Zloty?

There are 13.402649300673 East Caribbean Dollars in 10 Polish Zlotys. This is calculated by multiplying 10 by 1.3402649300673.
Formula: 10 Polish Zlotys × 1.3402649300673 = 13.402649300673 East Caribbean Dollars.
This conversion is helpful for measurements.

How many East Caribbean Dollar(s) in 50 Polish Zloty?

There are 67.013246503367 East Caribbean Dollars in 50 Polish Zlotys. One can calculate it by multiplying 50 by 1.3402649300673.
Formula: 50 Polish Zlotys × 1.3402649300673 = 67.013246503367 East Caribbean Dollars.
This conversion is used in many applications.

How many East Caribbean Dollar(s) in 100 Polish Zloty?

There are 134.02649300673 East Caribbean Dollar(s) in 100 Polish Zlotys. Multiply 100 by 1.3402649300673 to get the result.
Formula: 100 Polish Zlotys × 1.3402649300673 = 134.02649300673 East Caribbean Dollar(s).
This is a basic currency conversion formula.