Stuart Computer Services, Inc. has been in business for six months. The following are basic operating data for that period: 422 320 330 $6,000 $6,600 $12,900 $21,100 $16,000 $16,500 $4,230 $5,280 7,170 $11,150 9,190 $10,530 120 132 258 Required a. What is the average service revenue per hour in each month and the overall average for the six-month period? c. Determine the average contribution margin per hour the high-low method to estimate the total monthly fixed cost and the variable cost per hour Complete this question by entering your answers in the tabs below. the h ethe total monthly fixed cost and the variable cost per hour. (Do not round intermediate to to 2 cost