The USA has a 25 cent coin which most people refer to as a "Quarter", ie. one quarter of a Dollar.
command
The quarter.
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
the ratio at which a unit of the currency of one country can be exchanged for that of Another Country. (www.dictionary.com)
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).
Foreign exchange or Forex refer to exchanging one country's currency by another country's currency.
Foreign Exchange (FX) rate
Foreign exchange refer to the act of exchanging one country's currency by a different country's currency.
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.
The exchange rate is the value of one currency in relation to another currency. It determines how much of one currency is needed to purchase a unit of another currency. Exchange rates fluctuate based on market forces, such as supply and demand, economic indicators, and geopolitical events.