Please assist with part B

Gibson 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 $6,384 $4,240 Aug. 138 $7,866 $5,220 Month Sept. Oct. 256 424 $14,592 $24,168 $ 7,130 $11,170 Nov. 322 $18,354 $ 9, 110 Dec. 330 $18,810 $10,570 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. Answer is complete but not entirely correct. 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 Fixed cost 23.00 X per hour 1,842 X per month