Corporation manufactured 200,000 boxes during April The overhead cost-allocation base is $5.00 per machine-hour The following varlable overhead data pertain to April: Actual Production 200.000 boxes Machine-hours 9,000 hours Variable overhead cost per machine-hour $6.00 What is the variable overhead efficiency variance? A $5,000F B. $10,000U C. $10.000F D. $5,0000 Budgeted 200,000 boxes 10,000 hours $5.00