Cost and Revenue (S) X Curve C Curve D Pa Quantity 53. Refer to the above figure. Which curve depicts the marginal-revenue curve for a monopoly firm? a. A b B C. C d. D 54. How is a monopolist's profit-maximizing quantity of output determined? a. by the intersection of the marginal-revenue curve and the marginal-cost curve b. by the intersection of the marginal-revenue curve and the average-total-cost curve C. by the intersection of the average revenue curve and the marginal-cost curve d. by the intersection of the demand curve and the average-total-cost curve@ q 55. Refer to the above figure. How much is the price charged by the firm? a. $3.75 b. 54.36 C. 58 d. 512.51 9 q 56. Refer to the above figure. What is the amount of profit of this monopoly firm? $5.75 b.54.36 5 d. $12.51