Air Yacht Inc.'s personal jet's price function is p = 400 - 0.02r In r where r denotes the number of jets and p is the price per jet in thousands of dollars. a) What price should the company set their personal jet at if they want to sell 600 jets? b) What is this company's revenue function for their personal jets? Use this to find the actual revenue from the sale of the 601st jet, if 600 jets have already been sold. c) Find the marginal revenue function and use it to estimate the revenue from the sale of the 601st jet. What number did you evaluate your marginal revenue function at? Explain why