Quantity(coats per day) Total cost(dollars per coat)…

  Quantity(coats per day) Total cost(dollars per coat) 7 1,410 8 1,640 9 1,910 10 2,210 11 2,560 The table above shows the total cost incurred by Sue’s Coat Shop, a perfectly competitive firm. If the market price of a coat is $285, Sue’s will maximize economic profit by selling ________ coats a day.