Rooney Computer Services, Inc. has been in business for six months. The following are basic operating data for that period: Month Service hours July 118 Aug. 130 Sept. Oct. Nov. Dec. Revenue $6,726 Operating costs $4,290 264 $7,410 $15,048 $23,940 $5,300 $7,120 $11,160 420 316 $18,012 $9,140 330 $18,810 $10,550 Required a. What is the average service revenue per hour in each month and the overall average for the six-month period? b. Use the high-low method to estimate the total monthly fixed cost and the variable cost per hour. c. Determine the average contribution margin per hour. Complete this question by entering your answers in the tabs below. Required A Required B Required C What is the average service revenue per hour in each month and the overall average for the six-month period? Month Average service revenue per hour July Aug- Sept. Oct. Nov. Dec. Total Average $ 0 Requing A Required B >