Stuart Computer Services, Inc. has been in business for sik months. The following are basic operating data for that period: Month 330 $6,000 $6,600 $12,900 $21,100$16,000$16,500 Operating costs $4,230 $5,2807,170 $11,150 9,190 $10.530 120 132 258 422 320 Service hours 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 ve Required B