Kropf Inc. has provided the following data conceming one of the products in its standard cost system. Variable manufacturing overhead is applied to products on the basis of direct labor-hours. Topsta Direct materials Direct labor Variable manufacturing overhead Sanders Quantity wr Rours per Unit of Outpu 8.20 litere 0.50 hours 0.50 hours Standard Price on Rate $7.00 per liter $29.70 per hour $6.70 per hour 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 Actual direct labor-hours Actual direct labor cost Actual variable overhead cost 10,400 units 87,800 liters $690,500 85,310 liters 4,700 hours $145,302 8 27,414 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 (.e., zero varlance). Input all amounts as positive values.) a. Materials price variance b. Materials quantity variance ic. Labor rate variance d. Labor efficiency variance e. Variable overhead rate variance Variable overhead efficiency variance