Economics question. Please help!

You are the manager of a monopoly. Your analytics department estimates that a typical consumer's inverse demand function for your firm's product is P= 400 -40Q, and your cost function is C(Q) = 240Q. a. Determine the optimal two-part pricing strategy. Per-unit fee: $ Fixed fee: $ b. How much additional profit do you earn using a two-part pricing strategy compared with charging this consumer a per-unit price? $