Answer:
B) -$10 billion.
Step-by-step explanation:
The net capital outflow (NFO) is the difference between exports and imports
It is the net effect of the imports and exports.
20 - 30 = -10 billions There is a trade deficit
Foreigners purchased more goods than resident of the economy purchased foreing goods.
The NFO is negative.
With the national saving and the NFO we can calcualte the investment:
S = I + NFO
25 = I - 10
I = 25 + 10 = 35