Answer the following questions using the information below:

Russo Corporation manufactured 16,000 air conditioners during November. The overhead cost-allocation base is $31.50 per machine-hour. The following variable overhead data pertain to November:

	Actual	Budgeted
Production	16,000 units	18,000 units
Machine-hours	7,875 hours	9,000 hours
Variable overhead cost per machine-hour:	$31.00	$31.50

1) What is the actual variable overhead cost? 2)What is the flexible-budget amount of overhead cost ? 3) What is the variable overhead spending variance ? 4) What is the variable overhead efficiency variance?