Juhasz Corporation makes a product with the following standards for direct labor and variable overhead: Standard Quantity or Hours Standard Price or Rate Direct labor 0.5hours $ 20.00 per hour Variable overhead 0.5 hours $ 4.00per hour In August the company produced 7,900 units using 4,080 direct labor-hours. The actual variable overhead cost was $15,096. The company applies variable overhead on the basis of direct labor-hours. The variable overhead efficiency variance for August is: $481 U 0$520 U O $520 F O $481 F