Zachary Computer Services, Inc. has been in business for six months. The following are basic operating data for that period: Month July Sept. 256 $15,104 $ 7,200 Aug. 134 Oct. Nov. 322 Dec. Service hours 328 $19,352 $10,560 114 422 $6,726 $4,220 $7,906 $5,270 $24,898 $11,180 $18,998 $ 9,160 Revenue Operating costs 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 July Aug. Sept. Oct. Nov. Dec. Total Average Average service revenue per hour Required A Required B > Required A Required B Required C Use the high-low method to estimate the total monthly fixed cost and the variable cost per hour. (Do not round intermediate icalculations. Round "Variable cost" to 2 decimal places and "Fixed cost" to nearest whole dollar.) Variable cost per hour Fixed cost per month < Required A Required C > Required A Required B Required C Determine the average contribution margin per hour. (Round your answer to 2 decimal places.) ....... .... Average contribution margin per hour Required B Required C >