360 1 For a company that manufactures tennis rackets, the average cost per racket is found to be C = +4+ x for x21, where x is the number of rackets produced per hour. Use the differential to approximate the change in average cost per racket if production is (A) increased from 15 per hour to 20 per hour and (B) increased from 45 per hour to 50 per hour. (A) If production is increased from 15 per hour to 20 per hour the average cost per racket will V by approximately $ per racket. (B) If production is increased from 45 per hour to 50 per hour the average cost per racket will roximately $ per racket. decrease increase

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