Suppose that the inverse demand function for a monopolist’s product is p = 9 - Q/20. Its cost function is C = 10 + 10Q - 4Q² + 2/3 Q³. Draw marginal revenue and marginal cost curves. At what outputs does marginal revenue equal marginal cost? What is the profit-maximizing output? Check the second-order condition, d²­π/dQ², at the monopoly optimum.