Answer: Country A $1,600
Step-by-step explanation:
Country A's currency is stronger than Country B's which is why Country B needs more of its currency to buy a single unit of Currency A.
You can use direct proportion to find out Country B's GDP in Country A dollars
Country B currency to Country A
1.5 : 1
2,400 : x
1.5x = 2,400
x = 2,400 / 1.5
= Country A $1,600