Economists from Funlandia have collected the following information about the economy (all measured in billions of bucks): Y = 12, C= 9, T = 2, and G = 2.5. The economists also estimate the investment function is I = 2 – 0.5r where r is the country’s real interest rate expressed as a percentage. Calculate private saving, public saving, national saving, investment, and the real interest rate.

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