Answer:
1.3211 Swiss francs are required to purchase one U.S. dollar
Explanation:
The purchasing power parity theory states that the same quantity of goods and services can be bought with different currencies of the same worth
28.80 Swiss francs has the same worth as 21.80 U.S. dollars
Therefore, 28.80/21.80 Swiss francs = 1.3211 Swiss francs are required to purchase one U.S. dollar