[Related to Solved Problem 11.4 on page 435] Santiago Delgado owns a copier store. He leases two copy machines for which he pays $20 each per day. He cannot increase the number of machines he leases without giving the office machine company six weeks’ notice. He can hire as many workers as he wants, at a cost of $40 per day per worker.

These are the only two inputs he uses to produce copies.

a. Fill in the remaining columns in the following table.

b. Draw the average total cost curve and marginal cost curve for Santiago’s store. Do these curves have the expected shape? Briefly explain.

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Quantity Quantity of Average of Copies Workers per Day Fixed Variable Total Cost Cost Total Marginal Cost Cost Cost 0 0 1 600 2 1,100 3 1,500 4 1,800 2,000 6. 5 2,100