
Q.43
M=P_A*A+P_B*B...(1)
when P_A=10, B=3, and solve 1 to get A=4
when P_A=20, A=5 solve 1 to get B=0
thus as P_A rises demand for A rises which is a characteristic of a giffen good and giffen => inferior good
also B will be a complement of A when D(demand for B)/D(P_A) <0 which holds here ..so (D)
