Question
S1: Payment for imports and exports is made through a system called foreign exchange.
P: The value of the money of one country in relation to the money of other countries is agreed upon.
Q: These rates of exchange vary from time to time.
R: For instance, an American dollar or a British pound sterling is worth certain amounts in the money of other countries.
S: Sometimes a United States dollar is worth 12 pesos in Mexico.
S6: Another time it may be worth eight pesos.
The proper sequence should be: