Stuart Computer Services, Inc. has been in business for six months. The following are basic operating data for that period: Aug Oct. Service hours Revenue Operating costs July 112 $5,600 $4,220 132 $6,600 $5,240 Month Sept. 258 426 $12,900 $21,300 $ 7,160 $11,120 Nov. 322 $16,100 $ 9, 110 Dec. 330 $16,500 $10,530 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 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 $ 21.97 per hour Fixed cost per month