3. The following information represents the aggregate expenditure (AE) for an economy: Consumption = 100 + 0.9 (Y-T) Investment = 200 Government spending = 50 NB: Assume the government has a balanced budget. a) Calculate the equilibrium level of income [3 marks] b) Calculate the multiplier in the economy [2 marks] c) If government want to double equilibrium GDP, by how much must government spending increase? [3 marks] d) Now assume in "c" above government must maintain a balance budget, calculate the net effect on GDP. [5 marks]