Luma Inc. has provided the following data concerning one of the products in its standard cost system Inputs Direct materials Standard Quantity or Hours per Unit of Output 4.8 ounces Standard Price or Rate $6.90 per ounce The company has reported the following actual results for the product for September: Actual output Raw materials purchased Actual price of raw materials Actual cost of raw materials purchased Raw materials used in production 2,100 units 10,500 ounces $ 7.80 per ounce $81,900 10,890 ounces The raw materials quantity variance for the month is closest to: Multiple Choice $69 F $78 F $69 U $78 U