rial d fo 2. Gates Cleaning Co. leases a vacuum cleaning system for a basic monthly ac fee plus an additional cost per hour used above a given minimum for each t / month. Given below is the information for the most recent six-month period on the number of machine hours of use and the total cost under this lease. ze Month Machine Hours Total Cost ght ours July 555 $158, 421 ne i August 444 127, 889 par September 222 48 , 292 exal October 111 31 , 881 eas November 124 34, 329 December 497 140, 979 You are to provide information for planning on the variable and fixed cost elements in this contract. Use the high-low method to (a) determine the variable cost per machine hour (please show your work) (6 points) and