Given Y=C+I+G+X , C=100+0.9^d , I=200-500r , M=0.8Y-2000r ,X=100-0.12Y-500r , G=200 , T=0.2 , L=800
a) Derive the equations for IS and LM curves.
b) compute the r and y in which the two markets are clearing.
c) compute the values of C,I,X,M
d) calculate the monetary and fiscal policy multipliers and interpret them