The Next Questions Refer to the Following

The next questions refer to the following.
The nation of North does 20% of its trade with East, 30% with West, and 50% with South. Suppose that, relative to a base year, North's currency appreciates 80% against East's currency, appreciates 40% against West's currency, and depreciates 10% against South's currency.
-Assuming all else remains constant,on a bilateral basis

A) East's currency has appreciated about 25% against West's currency
B) East's currency has depreciated about 30% against West's currency
C) East's currency has depreciated about 50% against South's currency
D) West's currency has appreciated about 35% against South's currency
E) West's currency has depreciated about 55% against South's currency