Wadding Corporation applies manufacturing overhead to products on the basis of standard machine-hours. For the most recent month, the company based its budget on 3,800 machine-hours. Budgeted and actual overhead costs for the month appear below: Actual Costs Original Budget Based on 3,800 Machine-Hours Variable overhead costs: Supplies $11,000 Indirect labor 29, 280 Fixed overhead costs: Supervision 19,900 Utilities 6,100 Factory depreciation 7,100 Total overhead cost $ 73,380 $12,030 30,000 19,540 5,990 7,410 $ 74,970 The company actually worked 4,000 machine-hours during the month. The standard hours allowed for the actual output were 3,990 machine-hours for the month. What was the overall variable overhead efficiency variance for the month