Merle Corporation applies manufacturing overhead to products on the basis of standard machine-hours. For the most recent month, the company based its budget on 4,000 machine-hours. Budgeted and actual overhead costs for the month appear below: Original Budget Based on 4,000 Machine-Hours Actual Costs Variable overhead costs: Supplies $14,000 $13,150 Indirect labor 27,200 24,390 Fixed overhead costs: Supervision 19,900 19,540 Utilities 4,700 4,360 Factory depreciation 8,800 8,620 Total overhead cost $74,600 $70,060 The company actually worked 3,690 machine-hours during the month. The standard hours allowed for the actual output were 3,620 machine-hours for the month. What was the overall variable overhead efficiency variance for the month?