Russo Corporation manufactured 21,000 air conditioners during November. The overhead cost-allocation base is $32.50 per machine-hour. The following variable overhead data pertain to November Production Machine-hours Variable overhead cost per machine-hour What is the total variable overhead variance? OA. $9,250.00 unfavorable B. $9,250.00 favorable OC. $4,062.50 favorable OD. $4,062.50 unfavorable Actual 21,000 units 10,375 hours $32.00 Budgeted 23,000 units 11,500 hours $32.50