23 Kropf 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. 10 Standard Quantity or Hours per Unit of Output 7.90 liters e.50 hours e.50 hours Inputs Direct materials Direct labor Variable manufacturing overhead points Standard Price or Rate $ 7.50 per liter $26.70 per hour $ 6.40 per hour eBook The company has reported the following actual results for the product for September: Print Actual output Raw naterials purchased Actual cost of raw materials purchased Raw naterials used in production Actual direct labor-hours 10,1e0 units se, 500 1iters $615, 500 79,800 liters 4,770 hours $130, 302 $ 23,814 References Actual direct labor cost Actual variable overhead cost Required: a. Compute the materials price variance for September. b. Compute the materials quantity variance for September, c. Compute the labor rate variance for September. d. Compute the labor efficiency variance for September. e. Compute the variable overhead rate variance for September. f. Compute the variable overhead efficiency variance for September. (Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (I.e., zero variance). Input all amounts as positive values.)