Brief Exercise 5-5 (Part Level Submission) Cullumber Corp. has collected the following data concerning its maintenance costs for the past 6 months. Units Produced Total Cost July 19,480 $37,769 August 34,624 51,936 September 38,952 59,510 October 23,804 41,116 November 43,280 80,609 December 41,116 67,084 (a1) Compute the variable cost per unit using the high-low method.