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C. NATIONAL INCOME DETERMINATION 1. Given the following: G = 50; 1 = 40; C = 0.75Yd + 45; I= 0.2Y + 80. a. (3 points). Express the disposable income function. b. (3 points). Calculate the equilibrium level of national income. c. (3 points). Calculate the marginal propensity to save. d. (3 points). Calculate the value of tax (T)