i have a college macroeconomics question due tommorow can u help??

economy decribed as follows:
C=14,000+.5(y-t)-40,000r
I=8000-20,000r
G=7000
NX=-1800
T=8000
Y=40000
1)find a numeric equation relating planned aggregate expenditure to output and the real interest rate??
2)at what value should the fed set the real interest rate to eliminate any output gap???
please let me know A.S.A.P.

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