Costello Corporation manufactures a single product. The standard

Costello Corporation manufactures a single product. The standard cost per unit of product is shown below.
Direct materials—1 pound plastic at $7.00 per pound .....$ 7.00
Direct labor—1.6 hours at $12.00 per hour ...........19.20
Variable manufacturing overhead ..............12.00
Fixed manufacturing overhead ..............4.00
Total standard cost per unit ...............$42.20
The predetermined manufacturing overhead rate is $10 per direct labor hour ($16.00 ÷ 1.6). It was computed from a master manufacturing overhead budget based on normal production of 8,000 direct labor hours (5,000 units) for the month. The master budget showed total variable costs of $60,000 ($7.50 per hour) and total fixed overhead costs of $20,000 ($2.50 per hour). Actual costs for October in producing 4,900 units were as follows.
Direct materials (5,100 pounds) .....$ 36,720
Direct labor (7,500 hours) ........93,750
Variable overhead ...........59,700
Fixed overhead ............21,000
Total manufacturing costs .......$211,170
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.
Instructions
(a) Compute all of the materials and labor variances.
(b) Compute the total overhead variance.

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