Costello Corporation manufactures a single product. The standard cost per unit of product is shown below. Direct materials—3 pound plastic at $7.77 per pound $ 23.31 Direct labor—1.00 hours at $11.00 per hour 11.00 Variable manufacturing overhead 7.50 Fixed manufacturing overhead 4.50 Total standard cost per unit $46.31 The predetermined manufacturing overhead rate is $12 per direct labor hour ($12.00 ÷ 1.00). It was computed from a master manufacturing overhead budget based on normal production of 5,400 direct labor hours (5,400 units) for the month. The master budget showed total variable costs of $40,500 ($7.50 per hour) and total fixed overhead costs of $24,300 ($4.50 per hour). Actual costs for October in producing 3,300 units were as follows. Direct materials (10,070 pounds) $ 79,956 Direct labor (3,100 hours) 34,813 Variable overhead 28,985 Fixed overhead 12,795 Total manufacturing costs $156,549 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. (Round answers to 0 decimal places, e.g. 125.) Total materials variance $ Materials price variance $ Materials quantity variance $ Total labor variance $ Labor price variance $ Labor quantity variance $ (b) Compute the total overhead variance. Total overhead variance $