The table below depicts the cost and demand structure a natural monopoly faces.

a. Calculate total revenues, marginal revenue, and marginal cost at each output level. If this firm is allowed to operate as a monopolist, what will be the quantity produced and the price charged by the firm? What will be the amount of monopoly profit?
b. If regulators require the firm to practice marginal cost pricing, what quantity will it produce, and what price will it charge? What is the firm's profit under this regulatory framework?
c. If regulators require the firm to practice average cost pricing, what quantity will it produce, and what price will it charge? What is the firm's profit under this regulatory framework?

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Quantity Price () ong-Run Total Cost ($) 100 95 90 85 80 75 70 92 255 331 406 480