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. Consider an economy with the given equations. Y = C + I + G + NX Y=$6000 G=$ 1000 T=$ 1200 C=$300+0.60(YT) I=1 100-50r NX=157015'?0 r=r*=? a. In this economy, solve for private saving, public saving, national saving, investment, the trade balance, and the equilibrium exchange rate. b. Suppose now that G rises to $1400. Solve for private saving, public saving, national saving, investment, the trade balance, and the equilibrium exchange rate. c. Suppose that the world interest rate rises from 5 to 10 percent. Solve for private saving, public saving, national saving, investment, the trade balance, and the equilibrium exchange rate. Assume that G is equal to 1400 from the last part of this