Cullumber Corp. has collected the following data concerning its maintenance costs for the past 6 months. Units Produced Total Cost July 23,040 $46,080 August 40,960 61,440 September 46,080 70,400 October 28,160 48,640 Novemb 51,200 95,360 December 48,640 79,360 (a 1) Compute the variable cost per unit using the high-low method. (Round answer to 2 decimal places, eg, 2.25.) 15c N