Consider a competitive industry with a market demand curve of P = 121 – Q, where P is market price and Q is the quantity demanded in the market. In the short run there are 4 firms in the industry, and each firm has a total cost function of TC = 25 + 6q + q2, where q is output of the individual firm. In the long-run market equilibrium what is the number of firms in the industry? Group of answer choices 26 15 5 110 21

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