DBZ, Inc. makes a product with the following standards for direct labor and variable overhead: Direct labor Variable overhead Standard Quantity or Hours 0.40 hours 0.40 hours Standard Price or Rate $35.00 per hour $ 5.50 per hour In August the company produced 9,400 units using 3,860 direct labor-hours. The actual variable overhead cost was $20,072. The company applies variable overhead on the basis of direct labor-hours. The variable overhead efficiency variance for August is: Multiple Choice $520 Unfavorable $550 Unfavorable $520 Favorable $550 Favorable