The following information is available for a company's maintenance cost over the last seven months. Month Units Produced Maintenance Cost June 180 July 360 August 240 September 300 October 420 November 480 December 120 $ 10,900 13,800 10,200 12,000 13,800 16,200 7,200 Using the high-low method, the variable component of its maintenance cost is: Multiple Choice $30.00 per unit. $25.00 per unit. $22.50 per unit. $16.11 per unit. $22.00 per unit.