MATH-1325-PHW_09, 2022-04-05 15:58 8 6. (10 points) If the price charged for a laptop is p(x) dollars, then ar laptops will be sold in a cetain store, where P(I) = 1200 - - You may assume that x 2 0 and p(x) 2 0. (a) Find an expression for the total revenue from the sale of r laptops at a unit price of p(r). (b) Find the value of a that leads to maximum revenue. (c) Find the maximum revenue