The cheese business in Lake Fon-du-lac, Wisconsin, is a competitive industry. All cheese

manufacturers have the cost function C = Q^2+ 16, while demand for cheese in the town is given by Qd= 120 - P. The long-run equilibrium number of firms in this industry is

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a. 29.

b. 58.

c. 56.

d. 120.

e. 59

which is the correct answer and why?