Hot Air Balloon Rides (HABR) is a single-price monopoly. Columns 1 and 2 of the table set out the market demand schedule, and columns 2 and 5 set out the total cost schedule. Price Quantity Total reve- Marginal Total Marginal (dollars demanded nue revenue Cost (dol- Cost per (rides per (dollars (dollars lars per (dollars per ride) month) per month) per ride) month) ride) 220 0 80 200 1 160 180 2 260 160 3 Underline (U) 380 140 4 520 120 5 680 a) Calculate HABR's total revenue, marginal revenue, and marginal cost. Calculate MR and MC at the mid-points of the output level (15 points) b) Find Hot Air Balloon Rides profit-maximizing output and price. (15 points) C) Calculate HARB's economic profit. (10 points)