help: expected future marginal product of capital is MPKf = 20 -0.02K, where K is the future capital stock. depreciation is .2 or d =.2 current capital stock is 900 or Kt = 900 taxes is .5 or t = .5 consumption function is C = 100 + .5Y - 200r or Cd = C = 100 + .5Y - 200r output is 1000 or Y 1000 government purchases is 200 or G =200 real interest rate is .1 or r =.1 user cost of capital: uc = (r + d)/1 - t = (.1 + .2)/.5 = .6 desired future capital stock: 20 - .02Kdt+1(the "d" is on top right of K and the "t+1" is on the bottom right of K) = .6 and Kdt+1 = 970 (the "d" is on top right of K and the "t+1" is on the bottom right of K) desired level of investment: Kdt+1(the "d" is on top right of K and the "t+1" is on the bottom right of K) - Kt + dKt = 970 - 900 + 180 = 250 My question is how was the 970 from the desired future capital stock determined? Thanks