Bulluck Corporation makes a product with the following standard costs: Direct materials Direct labor Variable overhead Standard Quantity or Hours 3.5 grams 0.7 hours 0.7 hours Standard Price or Rate $ 1.00 per gram $11.00 per hour $ 2.00 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 3,000 units 11,370 grans 1,910 hours 12,100 grams $ 1.20 per gran $ 11.40 per hour $ 2.10 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 o $380 F o $399 U o S399 F o S380 U