Adams Computer Services, Inc. has been in business for six months. The following are basic operating data for that period: Month July Aug. Sept. Oct. Nov. Dec. Service hours 118 132 254 428 324 334 Revenue $ 6,254 $ 6,996 $ 13,462 $ 22,684 $ 17,172 $ 17,702 Operating costs $ 4,230 $ 5,220 $ 7,120 $ 11,200 $ 9,160 $ 10,560 Required What is the average service revenue per hour in each month and the overall average for the six-month period? Use the high-low method to estimate the total monthly fixed cost and the variable cost per hour. Determine the average contribution margin per hour.