The following set of equations describe an economy:
C = 14,000 + 0.6(Y - T) - 50,000r
I p = 7,000 - 25,000r
G = 8,000
NX = 2,000
T = 8,200
Y* = 46,450
a. Find a numerical equation relating planned aggregate expenditure to output and to the real interest rate.