Help me with the question

(1) The Keynesian-Crass. Model Consider a closed economy to which the Keynesian-cross analysis applies. Consumption is given by the equation C = 200 + 2/3(Y T}. Planned investment is 300. as are government spending and taxes. (21) If Y is 1,500, what is planned spending? (b) What is equilibrium Y? [Hintz Substitute the values of equations for planned consump- tion. investment, and government spending into the equation Y = C + I + G and then solve for Y] . [c] How much does equilibrium income decrease when G is reduced to 200