The following table shows the agency’s estimates of Joe’s demand and costs after the advertising campaign.
Joe’s Gourmet Hamburgers:
With Advertising Campaign Quantity Sold/Hour ATC MC P MR 1 $31.50 $12.50 $15.00 $15.00 2 18.75 6.00 13.75 12.50 3 13.17 2.00 12.50 10.00 4 10.50 2.50 11.25 7.50 5 9.00 3.00 10.00 5.00 6 8.08 3.50 8.75 2.50 7 7.50 4.00 7.50 0 8 7.13 4.50 6.25 −2.50 ■

a. Joe’s profit-maximizing quantity here is hamburgers.
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b. His profit-maximizing price is .
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c. At this quantity and price, Joe’s economic profit would be