Step-by-step explanation:
a. Total income formula is:
Y= C+I+G+NX
Y=20.1+3.5+5.2+(-1)
Y= $27.8 billion
b. In closed economies, income is calculated with this formula:
I=Y-C-G
I= 1.5-1-0.8
I= -$0.3 trillion
In open economies, income cannot be calculated because net exports (NX) data is missing.
c. NX is
NX= 576-445-115-81
NX= -$65 billion
NX is exports minus imports, in this case imports are more than exports. To calculate exports you need imports data.