If 5 Swiss francs trade for $1, the U. S. price level equals $1 per good, and the Swiss price level equals 2 francs per good, then the real exchange rate between Swiss goods and U. S. goods is Swiss good(s) per U. S. good.

0.4 swiss good(s) per U.S good(s)

Explanation:

firstly we calculate how many dollars we get per Frank so we will say $1/ 5 Swiss Franks =$0.2 which is similar to (5x =1, solve for x =1/5 / 0.2 in simple maths )per Swiss Franc thereafter we calculate the how many Swiss Francs per good compared to dollars per good we can get so therefore 2 Swiss Francs per good/$1 per good is the ratio of comparison , hence we treat f(X) as a function of swiss good(s) per U.S good, therefore f(X)= 2 x , knowing that x= 0.2 f(x)= 2(0.2) which will result in f(x)= 0.4.

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