PCC and CDW are two online retailers that compete in an intenet market for degital cameras. Their product are somhow diffrentialted and over the last couple of months, PCC has mathched CDW's price cut, but has not matched it price changes. The inverse demand for CDW is P=1250-2Q when the PCC matches CDW's price changes, and when it does not matche, the demand curse is etimated as P=800-0.50Q.
a) What are the demand and MR oF CDW over the last couple of months?
b) Over what range will changes in marginal cost have no effect on CDW's profit-maximizing level of output?