The predetermined manufacturing overhead rate is $14 per direct labor hour ($35.00+2.50). It was computed from a master manufacturing overhead budget based on normal production of 13,250 direct labor hours (5,300 units) for the month. The master budget showed total variable costs of $92,750 ($7.00 per hour) and total fixed overhead costs of $92,750 ($7.00 per hour). Actual costs for October in producing 3,900 units were as follows. Direct materials (4,030 pounds) $28,613 Direct labor (9,600 hours) 116,160 Variable overhead 103,738. Fixed overhead 34,862 Total manufacturing costs $283,373 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 materials variance Materials price variance $