Suppose that in your country the marginal propensity to save equals 15 percent of disposable income. When income is null, consumption is C = 150. Further assume fixed government expenditure of G = 100, fixed taxes of T = 80, and investment of I = 50. Calculate the equilibrium level of GDP. Solve for a change in GDP following an increase in expenditure of 20 percent, financed by an increase in taxes by the same amount. What does it tell you about the impact of expenditure that is fully financed by taxation?