Suppose the government raises its revenue by a net tax of 20 percent on income, t = 0.2, the marginal propensity to consume out of disposable income is 0.75, the marginal propensity to import is 0.2, and the government has an outstanding public debt of 900. In addition, the autonomous expenditure in households, business and foreign sectors (C + I + X - IM) is 300 and government expenditure is 300.

a)What is the public debt ratio?

b)Now, suppose the government increases its expenditures by 130 to provide additional funding for national defense. What is the size of the outstanding public debt after the increase in government expenditure, assuming the economy has reached its new equilibrium national income in one year?

c)What is the debt ratio after the increase in government expenditure and equilibrium income?