Q 3. A company manufactures and sells r smartphones per month. The monthly cost and price demand equations are C(x) = 72, 000 + 60x p = 200 30 0 < < 6000 (a) Find the maximum revenue. (b) Find the maximum profit, the production level that will realize the maximum profit, and the price the company should charge for each Smartphone. (c) If the government decides to tax the company 5 Cedis for each Smartphone it produces, how many smartphones should the company manufacture each month to maximize its profit? What is the maximum profit? What should the company charge for each Smartphone?