Problem-solving problem: Use the following data for a pure monopoly to find out the firm's: (a) total revenue, marginal revenue, marginal costs, and average total cost; (b) its profit-maximizing output level and produce price; (c) its profit. (d) Use the price-cost formula to determine whether or not the firm's operations are productively-efficient. (e) Use the price-cost formula to determine whether or not the firm's operations are allocatively efficient.