Price/Cost ($) Demand MR 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 9 Quantity (units) Refer to the figure above. What is the price at which the monopolist should sell its output? 1) choose the one you think is correct, 2) explain why this is correct or choose one incorrect option and explain why that option is incorrect (use theories you learnt from the course to explain, give proper calculation if needed) A. $9 B. $3 C. $6 D. $4