Thornton Computer Services, Inc. has been in business for sik months. The following are basic operating data for that period: Month Dec Sept. 260 oct. Service hours 120 136 420 320 330 6,000 6,800 $13,000 $21,000 $16,000 $16, 500 $4,300 $5,300 $ 7,100 $11,200 $ 9,100 s10, 600 Operating costs Required a. What is the averag 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. e service revenue per hour in each month and the overall average for the six-month period? 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? July Aug Sept. Oct. Nov. Dec. Total Average Required B>