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. Direct materials Dace tabor Variable manufacturing overhead Standard Quantity or Hours per Unit of Outpat 7.50 liters 0.50 hours 0.50 hours Standard Price or Race $.7.10 per liter $22.70 per hour $ 6.00 per hour The company has reported the following actual results for the product for September at purchased al cost of material purchased A Trio ed in production Actual direct labor-hours tual direct labor cost Asturiable overhead coat 9.700 unit. 75, 100 liters 6563, 500 72.770 11teS 4.600 hours $110, 102 23.414 Required: a Compute the materials price variance for September Compute the materials quantity variance for September C. Compute the labor rate variance for September d Compute the labor efficiency variance for September