Rundle Computer Services, Incorporated, has been in business for six months. The following are basic operating data for that period:

Month

July August September October November December

Service hours $112138258426324332$

Revenue $ $6,160$ $ $7,590$ $ $14,190$ $ $23,430$ $ $17,820$ $ $18,260$

Operating costs $ $4,220$ $ $5,240$ $ $7,120$ $ $11,200$ $ $9,170$ $ $10,530$

Required

What is the average service revenue per hour in each month and the overall average for the six$-$month period?

Use the high$-$low method to estimate the total monthly fixed cost and the variable cost per hour.

Determine the average contribution margin per hour.