10) Let the national income model be written in the form Y-C-lo-Go = 0 C-a-B(Y-T) = 0 T-Y-SY 0 where the endogenous variables are Y (national income), C ((planned) consumption expenditure) and 7 (taxation), and the exogenous variables are lo (investment expenditure) and Go (government expenditure). a) Find the government expenditure multiplier by the implicit function rule. b) Find the nonincome tax multiplier by the implicit function rule.