400 1 for a company that manufactures tennis rackets, the average cost per racket is found to be C=- X +2+x for x 1, where x is the number of rackets produced per 5 hour. Use the differential to approximate the change in average cost per racket if production is (A) increased from 20 per hour to 26 per hour and (B) increased from 40 per hour o 46 per hour. (A) If production is increased from 20 per hour to 26 per hour the average cost per racket will (B) If production is increased from 40 per hour to 46 per hour the average cost per racket will by approximately $ per racket. by approximately $ per racket.