Problem: lilas makeup company has collected the following data concerning its maintenance costs for the past 6 months. Units Produced Total Maintenance Costs July 18,000 $36,000 August 32,000 48,000 September 36,000 55,000 October 22,000 38,000 November 40,000 74,500 December 38,000 62,000 Compute the unit variable costs and fixed costs using the high-low method for this mixed cost. Determine missing amounts for contribution margin.