Stuart Computer Services, Inc. has been in business for six months. The following are basic operating data for that period Service hours Revenue Operating costs July 112 $6,048 $4,240 Aug. 136 $7,344 $5,290 Month Sept. Oct. 264 430 $14,256 $23,220 $ 7,120 $11,140 Nov. 322 $17,388 $ 9,170 Dec. 330 $17,820 $10,500 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 Determine the average contribution margin per hour (Round your answer to 2 decimal places.) Average contribution margin per hour