c) Given the following equations: y= cti+g+x c=200+0.8y" (consumption function), / = 150-400r (investment function), m = 0.8y -1500r (real demand function), x =100-0.12y -400r (net export) 8 = 250, (government purchases) 7 = 0.25 (tax rate), 1 = 900 (real money supply). i. Calculate the values of y and r, at equilibrium (7mks) ii. Calculate the values of investment and exports