3. (24 Marks) Note: You are expected to show the relevant steps of your calculations. a) With a tax rate of 15%, Zambazia's economy is described by the following expenditure functions; C = 200 +0.8YD G = 650 I = 840 NX = 110-0.12Y Calculate the following; (3 marks each) i. the marginal propensity to spend out of national income ii. the equilibrium level of national income. iii. the equilibrium value of consumption iv. the equilibrium value of national asset formation V. the simple multiplier if the tax rate increased to 20% Please explain each step very carefully and clearly