Tharaldson Corporation makes a product with the following standard costs: Standard Quantity or Hours Standard Price or Rate Standard Cost Per Unit Direct materials 7.0 ounces $ 3.00 per ounce $ 21.00 Direct labor 0.3 hours $ 14.00 per hour $ 4.20 Variable overhead 0.3 hours $ 9.00 per hour $ 2.70 The company reported the following results concerning this product in June. Originally budgeted output 2,400 units Actual output 2,900 units Raw materials used in production 21,000 ounces Purchases of raw materials 23,100 ounces Actual direct labor-hours 550 hours Actual cost of raw materials purchases $ 45,000 Actual direct labor cost $ 12,400 Actual variable overhead cost $ 3,200 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 variable overhead efficiency variance for June is: