Answer: $ 10 billion
Explanation: The equation needed to find the values of export and import is given by :
Y = C + I + G + (X - M)
Where;
Y -GDP
C - consumption
I - investment
G - government spending/ public sector spending
X - exports
M - imports
The following values are given from the question:
Y - $75 billion
C - $ 25 billion
I - $ 15 billion
G - $ 25 billion
X - ?
M - ?
75 = 25 + 15 + 25 + (X-M)
Making (X-M) the subject of the formula
(X-M) = 75 - 25 - 25 - 15
= 10 billion
The value of exports and imports is $ 10 billion