The question is as follows:

Q.4. Consider an economy described by the following equations: 0 = 300+0.6(YT) I = 70080:- 0 = T=500 d. (g) = Y200r M = 3000;P=3 a. Find the equation for the IS and LM curves. b. Find the equilibrium interest rate r and equilibrium income Y. c. Suppose that government purchases are increased from 500 to 700. How does the IS curve shift? What are the new equilibrium interest rate and income? d. With the initial values for monetary and scal policy, suppose the price level rises from 3 to 5. What happens? What are the new equilibrium interest rate and income? e. For the initial values of monetary and scal policy, derive and graph an equation for the aggregate demand curve