Bramble Corporation manufactures a single product. The standard cost per unit of product is shown below. $7.00 19.20 Direct materials-1 pound plastic at $7.00 per pound Direct labor-1.6 hours at $12.00 per hour Variable manufacturing overhead Fixed manufacturing overhead Total standard cost per unit 12.00 4.00 $42.20 The predetermined manufacturing overhead rate is $10 per direct labor hour ($16 +1.6). It was computed from a master manufacturing overhead budget based on normal production of 9,760 direct labor hours (6,100 units) for the month. The master budget showed total variable costs of $73,200 ($7.50 per hour) and total fixed overhead costs of $24,400 ($2.50 per hour). Actual costs for October in producing 5.940 units were as follows. Direct materials (6,180 pounds) Direct labor (9.070 hours) Variable overhead Fixed overhead Total manufacturing costs $ 44,496 114,282 72,960 25,200 $256,938 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 $