In an economy following data are given :

Consumption function :  C = 250 + 0.5 (Y - T) - 500r

Investment function :   I = 250 - 500r 

Real Money Supply :  M_d / P = 0.5y - 500r

Real Money Demand : M_s / P = 7650 / P 

Aggregate Supply = Full-employment level = = 1000

Government Expenditure = G = Tax = T = 200

Find out     (i) Equation of IS curve

                  (ii) Equation of LM curve

                  (iii) Equation of AD curve

                  (iv) Equilibrium values of P, r, C and I.

                  (v) Show graphically what happens to equilibrium values when money supply increases ? (300 words) (20 Marks)