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A profit-maximizing firm is perfectly competitive and is at long-run equilibrium

Economics

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A profit-maximizing firm is perfectly competitive and is at long-run equilibrium. The output of the firm is 200 units and the total revenue is $1,200.00.Based on the information given, which of the following applies for the firm? 

a. The firm's marginal cost is $4.00. 

b. The firm's marginal cost is $6.00 

c. The firm's marginal cost is $700 

d. The firm's marginal cost is $9.00