Suppose that a monopolist has a constant marginal cost curve. That is, for each unit of output that the monopolist produces, it costs an additional $30. The monopolist's marginal revenue is MR=120−6Q,...

Suppose that a monopolist has a constant marginal cost curve. That is, for each unit of output that the monopolist produces, it costs an additional $30. The monopolist's marginal revenue is MR=120−6Q, where Q is the quantity produced. The demand curve is P=120−3Q.

What is the monopolist's profit-maximizing output and price?