Citibank holds $ 23 million in foreign exchange assets and $ 18 million in foreign exchange liabilities.

Question:

Citibank holds $ 23 million in foreign exchange assets and $ 18 million in foreign exchange liabilities. Citibank also conducted foreign currency trading activity in which it bought $ 5 million in foreign exchange contracts and sold $ 12 million in foreign exchange contracts.
a. What is Citibank’s net foreign assets?
b. What is Citibank’s net foreign exchange bought?
c. What is Citibank’s net foreign exposure?