Samsung 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) Variable manufacturing overhead (2 hours at $5 per hour) 10 During November, 8,000 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 (18,400 hours at $9.75 per hour) 179,400 Variable manufacturing overhead incurred 110,400 What is the variable overhead spending variance for the product for November? $ 30,400 Unfavorable $ 18,400 Unfavorable $ 30,400 Favorable O$ 18,400 Favorable 20