You are the manager of a monopoly that faces an inverse demand described by P = 200 - 2Q. Your costs are TC = 25 + 20Q and marginal cost is MC = 20....

You are the manager of a monopoly that faces an inverse demand described by

P = 200 - 2Q. Your costs are TC = 25 + 20Q and marginal cost is MC = 20. The profit-maximizing output for your firm is:

A.  35.

B.  20.

C.  5.

D.  45.

 E.     90