Russo Corporation manufactured 20.000 air conditioners during November. The overhead cost-allocation rate is $32.50 per machine-hour. The following variable overhead data pertain to November Production Actual 20,000 units Machine-hours Variable overhead cost per machine-hour i What is the variable overhead efficiency variance? 9.825 hours Budgeted 22,000 units 11,000 hours $32.00 $32.50 OA. $5,687.50 favorable OB. $5,500.00 favorable Oc. $5,500.00 unfavorable OD. $5.687.50 unfavorable CHIO