Suppose C = 40 + 0.8Y D. T = 50, I = 60, G = 40, X = 90, M = 50 + 0.05Y <br>

(a) Find equilibrium income <br>

(b) Find the net export balance at equilibrium income <br>

(c) What happens to equilibrium income and the net export balance when the government purchases increase from 40 to 50?