The screw and bolt market contains many identical firms, each with a total cost function TC(q) = 400 5q + q, marginal cost function MC(q) = -5 + 2q, and average cost function AC(q) = % 5 + q, where q is the firm's annual output. The market demand curve for this industry is Qp = 262.5 ~50 Each firm in the industry is currently earning zero economic profit. How many firms are operating in this industry? What is the market equilibrium price in the long run