Problem 2-26A Estimating fixed and variable cost Thornton Computer Services, Inc. has been in business for six months. The following are basic operating data for that period: Month July Aug. Sept. Oct. Nov. Dec. 330 $6,000 6,800 $13,000 $21,000 $16,000 $16,500 $4,300 $5,300 7,100 $11,200 9,100 $10,600 Service hours 120 136 260 420 320 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 d. Use the scattergraph method to estimate the total monthly fixed cost and the variable cost per hour. e. Compare the results of the two methods and comment on the difference