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The W Company is a perfectly competitive beef producer

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The W Company is a perfectly competitive beef producer. The price of a beef is $60. The firm's total cost function is TC = 100 + 10Q + 5Q2 where TC is the total cost (in dollars) and Q is the hourly output.

a. What output maximizes profit?
b. What is the firm's economic profit at this output?
c. What is the firm's average cost at this output?
d. If other firms in the beef industry have the same cost function as this firm, is the industry in equilibrium? Why or why not?