Bulluck Corporation makes a product with the following standard costs: Standard Quantity or Hours 4.60 grams 0.60 hours 0.60 hours Direct materials Direct labor Variable overhead Standard Price or Rate $ 2.10 per gram $22.00 per hour $ 3.10 per hour The company reported the following results concerning this product in July Actual output Raw materials used in production Actual direct labor-hours Purchases of raw materials Actual price of raw materials purchased Actual direct labor rate Actual variable overhead rate 4,100 units 12,470 grams 2,280 hours 13, 200 grams $ 2.30 per gram $ 12.50 per hour $ 3.20 per hour The company applies variable overhead on the basis of direct labor-hours. The direct materials purchases variance is computed when the materials are purchased. The variable overhead efficiency variance for July is: Multiple Choice $558 U O $576 F O $558F