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

• NSF Lube performed 474,200 oil changes last year. It had budgeted 432,400 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 $25 per hour	$	5.00
Variable support staff and overhead: 6.0 minutes at $22 per hour		2.20

• Fixed overhead costs:

Annual budget $1,036,400

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

Direct oil specialist services: 474,200 changes averaging 15 minutes at $28 per hour	$	3,319,400
Variable support staff and overhead: 0.13 labor-hours at $15 per hour 474,200 changes		924,690
Fixed overhead		1,230,000

Required:

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