430 For a company that manufactures tennis rackets, the average cost per racket is found to be C = produced per hour. +3+ 3x for x≥1, where x is the number of rackets X Use the differential to approximate the change in average cost per racket if production is (A) increased from 10 per hour to 13 per hour and (B) increased from 40 per hour to 43 per hour. (A) If production is increased from 10 per hour to 13 per hour the average cost per racket will (B) If production is increased from 40 per hour to 43 per hour the average cost per racket will by approximately $ per racket. by approximately $ per racket