2) The following describes a certain economy C = 400 + 0.75Id    consumption function  I = 200 – 100r            investment function T = 70 + 0.2Y              Tax Function G = 100                      Government Expenditure X = 10                         Exports M = 150 + 0.06Y        Import Function Ms = 4000                Money Supply M^D = 0.2Y – 10r      Money Demand Required a) Derive the IS and LM  equation b) Calculate the equilibrium Y, C, T, M, and I

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