(30 points) Consider the following macro model in which the price level is fixed. Consumption Expenditure C = 50 + 0.70YD Investment Expenditure I = 75 Government Expenditures on Goods and Services G = 100 Taxes T = 0.2Y Government Transfer Payments to Households TR = 0 Exports X = 25 Imports M = 0.16Y a. What is the expression for planned aggregate expenditure (PAE)? Show graphically, make sure to label axes and lines. b. Explain in words how the PAE is affected by a change in government transfer payments