Apple Corporation produces a single product. The standard costs for one unit of its product are as follows: Direct materials (6 pounds at $0.50 per pound) $3 Direct labor (2 hours at $10 per hour) 20 Variable manufacturing overhead (2 hours at $5 per hour) 10 During November, 6,000 units were produced. The costs associated with November operations were as follows: Material purchased (36,000 pounds at $0.60 per pound) $21,600 Material used in production (28.000 pounds) Direct labor (12,800 hours at $9.75 per hour) 117,000 Variable manufacturing overhead incurred 53,760 What is the variable overhead efficiency variance for the product for November? (A) $ 8,000 Unfavorable B) $8,000 Favorable $ 4,000 Favorable $ 4,000 Unfavorable