Bramble Corp. has collected the following data concerning its maintenance costs for the past 6 months. Units Produced Total Cost July 18,000 $44,500 30,000 59,000 August September 34,000 68,000 October 20,000 44,000 November 41,000 96,250 December 39,000 91,750 (a1) Compute the variable cost per unit using the high-low method. (Round variable cost per mile to 2 decimal places e.g. 1.25.) Variable cost per unit $