Fluegge Inc. has provided the following data concerning one of the products in its standard cost system. Variable manufacturing overhead is applied to products on the basis of direct labor-hours. Inputs Standard Quantity or Hours per Unit of Output Standard Price or Rate Direct materials 5.7 liters $ 5.40 per liter Direct labor 0.70 hours $ 20.60 per hour Variable manufacturing overhead 0.70 hours $ 5.50 per hour The company has reported the following actual results for the product for December: Actual output 4,100 units Raw materials purchased 25,100 liters Actual price of raw materials $ 4.80 per liter Actual cost of raw materials purchased $ 120,480 Raw materials used in production 23,360 liters Actual direct labor-hours 2,700 hours Actual direct labor rate $ 21.20 per hour Actual direct labor cost $ 57,240 Actual variable overhead rate $ 5.90 per hour Actual variable overhead cost $ 15,930 The variable overhead rate variance for the month is closest to: $1,080 F $1,080 U $1,148 F $1,148 U