NSF Lube is a fast-growing chain of oil-change stores. The following data are available for last years services.

• NSF Lube performed 465,200 oil changes last year. It had budgeted 436,000 oil changes, averaging 12 minutes each.
• Standard variable labor and support costs per oil change were as follows.

Direct oil specialist services: 12 minutes at $28 per hour	$	5.60
Variable support staff and overhead: 8.0 minutes at $18 per hour		2.40

• Fixed overhead costs:

Annual budget $1,040,000

• Fixed overhead is applied at the rate of $2.40 per oil change.
• Actual oil change costs:

Direct oil specialist services: 465,200 changes averaging 15 minutes at $30 per hour	$	3,489,000
Variable support staff and overhead: 0.16 labor-hours at $16 per hour 465,200 changes		1,190,912
Fixed overhead		1,500,000

Required:

a. Prepare a cost variance analysis for each variable cost for last year. b. Prepare a fixed overhead cost variance analysis.