he following equations describe an economy.    Y=C+I+G    C=120+0.6(Y-T)    I=100-10r, G=60 T=40    M/P=Y-20r. M=600 P=20    a. Derive the equations for IS and LM curves.     b. Find the equilibrium level of income and the equilibrium interest rate.    c. Suppose government expenditure increases by 50%. Find the equilibrium interest rate and income.

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