Russo Corporation manufactured 16,000 air conditioners during November. The variable 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 $31.00 9,000 hours $31.50 Variable overhead cost per machine-hour: 7. What is the variable overhead spending variance? A) $4,500 unfavorable B) $3,937.50 unfavorable C) $4,500 favorable D) $3,937.50 favorable 8. What is the flexible budget variance for variable overhead? A) $7,875 unfavorable B) $3,937.50 f unfavorable C) $7,875 favorable D) $3,937.50 f favorable