The USA has a 25 cent coin which most people refer to as a "Quarter", ie. one quarter of a Dollar.
The quarter.
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Many countries have a quarter as a currency unit. Since you failed to identify any country in the question, it is not possible to give an answer.
A quarter in terms of U.S. Currency is worth 25 centers. 25 cents is one fourth of a dollar. So four quarters equal one dollar. A quarter is 25 pennies, and it is five nickels.
Floating exchange rate
One quarter of something is 1/4th of the total, or 25 percent. For currency, a quarter is worth 1/4th of a dollar (25 cents).
the ratio at which a unit of the currency of one country can be exchanged for that of Another Country. (www.dictionary.com)
When hard currency is not available for a country to use it can barter product s and goods for other products and goods. Bartering accounts for about a quarter of international trade.
Foreign exchange refer to the act of exchanging one country's currency by a different country's currency.
Foreign Exchange (FX) rate
Foreign exchange or Forex refer to exchanging one country's currency by another country's currency.
EXCHANGE RATE IS THE RATE AT WHICH ONE COUNTRY'S CURRENCY IS CHANGED FOR ANOTHER COUNTRY'S CURRENCY. FOR EXAMPLE THE RATE AT WHICH ONE DOLLAR CAN BE CHANGED FOR POUND STERLING OR ANY OTHER CURRENCY.