Question 4 Westerville Corp. has collected the following data concerning its maintenance costs for the past six months: Units Produced July 17,300 August 32,400 September 36,300 October 22,200 November 40,900 December 38,800 Total Cost $28,720 48,900 56,000 38,300 65,300 62,000 (al) Calculate the variable cost per unit using the high-low method. (Round variable cost per unit to 2 decimal places, e.g. 12.25.) Variable cost per unit