By what amount (in billion USD) is the Gross Domestic Product (GDP) of Country A lesser than that of Country F?

By what amount (in billion USD) is the Gross Domestic Product (GDP) of

1.	By what amount (in billion USD) is the Gross Domestic Product (GDP) of Country A lesser than that of Country F?
A.	20
B.	50
C.	25
D.	40
Answer» B. 50