Suppose the total revenue in dollars realized by Puritron from the sale of x water filters per month is given by the total revenue function () = 0.0005 2 + 20 (0 40,000) a. Find the total profit functionthat is, the function that describes the total profit Puritron realizes in manufacturing and selling x water filters per month. b. What is the profit when the level of production is 10,000 filters per month?