Ravena Labs., Incorporated 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. 14 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