Ravena Labs., Inc. makes a single product which has the following standards: Direct materials: 2.5 ounces at $20 per ounce Direct labor: 1.4 hours at $12.50 per hour Variable manufacturing overhead: 1.4 hours at 3.50 per hour Variable manufacturing overhead is applied on the basis of standard direct labor-hours. The following data are available for October: 3,750 units of compound were produced during the month. There was no beginning direct materials inventory. .Direct materials purchased: 12,000 ounces for $225,000. The ending direct materials inventory was 2,000 ounces. .Direct labor-hours worked: 5,600 hours at a cost of $67,200. Variable manufacturing overhead costs incurred amounted to $18,200. Variable manufacturing overhead applied to products: $18,375. The labor efficiency variance for October is: Multiple Choice $1,400 Favorable $1,900 Unfavorable $3,750 Favorable $4,375 Unfavorable