Answer:
C) 20.48%
Explanation:
I will use an example to show this:
1€ = $1
if the euro depreciates by 17%, then the exchange rate will be 0.83€ = $1
in order for the euro to recover its previous value against the dollar, it needs to increase 0.17€ / 0.83€ = 0.2048 = 20.48%
in other words, a 17% depreciation is equivalent to a 20.48% revaluation.
