Cullumber Corp. has collected the following data concerning its maintenance costs for the past 6 months. Total Cost July August September October November December Units Produced 19.080 33,920 38,160 23,320 42,400 40,280 $38,160 50,880 58,300 40,280 78,970 W 65,720 (a 1) Compute the variable cost per unit using the high-low method. (Round answer to 2 decimal places, eg. 2.25.) $ Variable cost per unit