Rogen Corporation manufactures a single product. The standard cost per unit of product is shown below. Direct materials-1 pound plastic at $6.00 per pound $ 6.00 Direct labor-0.5 hours at $12.30 per hour 6.15 Variable manufacturing overhead 3.25 Fixed manufacturing overhead 3.75 Total standard cost per unit $19.15 D. The predetermined manufacturing overhead rate is $14.00 per direct labor hour ($7.00+ 0.5). It was computed from a master manufacturing overhead budoet based on normal production of 2,500 direct labor hours (5,000 units) for the month. The master budget showed total variable costs of $16,250 ($6.50 per hour) and total foed overhead costs of $18,750 (57.50 per hour). Actual costs for October in producing 4.400 units were as follows Direct materials (4,560 pounds) $ 27,816 Direct tabor (2,100 hours) 26,250 Variable overhead 21,558 Fixed overhead 11,142 Total manufacturing costs $86,766 The purchasing department buys the quantities of raw materials that are expected to be used in production each month, Raw materials inventories, therefore, can be ignored (a) Compute all of the materials and labor variances Total materiais variance Compute all of the materials and labor variances. Total materials variance Materials price variance