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C = 1000 + 0.8(Y-T); I=300; T=100; G = 480; X = 500; M = 1000

Use above equations to answer below questions.

a. What is the AE function of this economy?
b. What is the eqm. aggregate expenditure of this economy?
c. What is the state of inventories, when Y= 5000?
d. What is the value of the multiplier for this economy?