Use Figure: Profit-Maximizing Quantity and Price

Use Figure: Profit-Maximizing Quantity and Price. The figure depicts the demand curve, marginal revenue curve, and marginal cost curve that are facing a monopolist. The profit-maximizing price for the monopolist is _____, and the profit-maximizing quantity is _____ units.
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Figure: Profit-Maximizing Quantity and Price

A) $12; 70
B) $10; 70
C) $12; 50
D) $10; 50