Oddo Corporation makes a product with the following standard costs: Standard Quantity or Hours Standard Price or Rate Standard Cost Per Unit Direct materials 3.0 ounces $21.00 $7.00 per ounce $20.00 per hour Direct labor 0.7 hours $14.00 Variable overhead 0.7 hours $5.00 per hour $3.50 The company reported the following results concerning this product in December 4,400 units 4,200 units 12,820 ounces 3.160 hours Originally budgeted output Actual output Raw materials used in production Actual direct labor-hours Purchases of raw materials Actual price of raw materials Actual direct labor rate Actual variable overhead rate 14,500 ounces $6.80 per ounce $18.30 per hour $5.10 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 labor efficiency variance for December is: $4,400 F $4,400 U $4,026 U $4,026 F