C = 100 + 0.8Yd - Consumption function

I = 10 - 10r- Investment function

L = Y - 100r - Real money demand

G =10 - Government purchases

T = 0.25 - Tax rate

MS = 295 - Real money supply

Suppose equilibrium income increases by 200, by how much must real money stock increase for the new level of income to be in equilibrium.