152. Math Puzzler $1 / 78$

Due to the ongoing crisis in capitalist states, the French Franc loses about 10 percent of its value annually.

How much would a good that costs 1 Franc today, on average, cost after three years, assuming a constant inflation rate?
After one year, the same goods cost 10 percent more due to devaluation, which is $\frac{1}{0.9}$ Franc. After three years, the average price of goods that initially cost 1 Franc is $\frac{1}{(0.9)^{3}}=\frac{1}{0.729}=$ 1.37 Franc.