11. The cost ( and the revenue R functions (in dollars) for producing and selling x units of a product ap. C= 45.5x + 20,000 and R = 80.5x We define a new function called average profit function in the following way. P =- a. Find the average profit function. b. Find the average profit when x is 2,000 C. What is the limit of the average profit function as x approaches infinity? Explainit your Reaxasize