Before World War I, $20.67 was needed to buy one ounce of gold. If, at the same

Question:

Before World War I, $20.67 was needed to buy one ounce of gold. If, at the same time one ounce of gold could be purchased in France for FF410.00, what was the exchange rate between French francs and U.S. dollars?

Exchange Rate
The value of one currency for the purpose of conversion to another. Exchange Rate means on any day, for purposes of determining the Dollar Equivalent of any currency other than Dollars, the rate at which such currency may be exchanged into Dollars...