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. Standard uantity or Hours per Unit of Standard Price or Rate Inputs Direct materials Output 9.00 liters 0.40 hours $ 8.60 per liter Direct labor $37.70 per hour $ 7.50 per hour Variable manufacturing overhead 0.40 hours The company has reported the following actual results for the product for September Actual output Raw materials purchased Actual cost of raw materials purchased Raw materials used in production 11,200 units 102,600 liters $896,500 100,820 1liters 4,300 hours $170,302 $27,414 Actual direct labor-hours 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. variance). Input all amounts as positive values.) zero a Materials price variance b. Materials quantity variance C. Labor rate variance d. Labor efficiency variance Variable overhead rate variance e. Variable overhead efficiency variance