A firm with market power faces the demand function, q = 150 – 10P. The firm's marginal cost function is MC(q) = 2 + 0.1q. If the firm establishes a block-pricing structure with two prices, the lower...

A firm with market power faces the demand function, q = 150 – 10P. The firm's marginal cost function is

MC(q) = 2 + 0.1q. If the firm establishes a block-pricing structure with two prices, the lower price that the firm will use to maximize producer surplus is $____.