Zachary Computer Services, Inc. has been in business for six months. The following are basic operating data for that period: July Service hours Revenue Operating costs 114 $6,726 $4,220 Aug. 134 $7,906 $5,270 Month Sept. Oct. 256 422 $15, 104 $24,898 $ 7,200 $11,180 Nov. 322 $18,998 $ 9, 160 Dec. 328 $19,352 $10,560 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 calculations. Round "Variable cost" to 2 decimal places and "Fixed cost" to nearest whole dollar.) Variable cost per hour Fixed cost per month