Sheffield Corporation manufactures a single product. The standard cost per unit of product is shown below. Direct materials-1 pound plastic at $8.00 per pound $8.00 Direct labor-0.50 hours at $11.10 per hour. 5.55 Variable manufacturing overhead Fixed manufacturing overhead 2.75 5.25 Total standard cost per unit $21.55 The predetermined manufacturing overhead rate is $16 per direct labor hour ($8.00 +0.50). It was computed from a master manufacturing overhead budget based on normal production of 2,500 direct labor hours (5,000 units) for the month. The master budget showed total variable costs of $13,750 ($5.50 per hour) and total fixed overhead costs of $26,250 ($10.50 per hour). Actual costs for October in producing 3,900 units were as follows. Direct materials (4,060 pounds) $ 32,886 Direct labor (1,750 hours) Variable overhead 19,950 21,838 Fixed overhead 11,362 Total manufacturing costs $86,036 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) 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 Materials quantity variance Total labor variance Labor price variance Labor quantity variance: (b) Compute the total overhead variance. Total overhead variance eTextbook and Media