7 . Russo Corporation manufactured 16,100 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 16000 units 8000 units Machine - hours 7875 hours 9000 hours Variable overhead cost per machine - hour $3100 831. 50 What is the total variable overhead variance A ) $7 875 unfavorable B ) $3 937 50 funfavorable C ) $7 875 favorable D ) $3 937 50 f favorable