Drives Co. sells portable hard drives. They can sell 600 drives when the price is $85/drive, and they can sell 720 drives when the price is $55/drive. If x represents the number of drives sold, determine the following.

(a) What is Drive Co.'s revenue function? R(x) =

(b) What is the price per drive (in dollars) when revenue is maximized? $

(c) What is the maximum profit (in dollars) made from the sale of these drives if Drive Co. incurs production costs of $175 per drive and has fixed costs of $675? $