P11-1A Stromski 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—1.5 hours at $12.00 per  hour	18.00
Variable manufacturing overhead	11.25
Fixed manufacturing overhead	3.75
Total standard cost per unit	$40.00

The predetermined manufacturing overhead rate is $10 per direct labor hour ($15.00 --- 1.5). It was computed from a master manufacturing overhead budget based on normal pro- duction of 7,500 direct labor hours (5,000 units) for the month. The master budget showed total variable costs of $56,250 ($7.50 per hour) and total fixed overhead costs of $18,750 ($2.50 per hour). Actual costs for October in producing 4,900 units were as follows.

 

Direct materials (5,100 pounds)	$  37,230
Direct labor (7,000  hours)	87,500
Variable overhead	56,170
Fixed overhead	19,680
Total manufacturing costs	$200,580

 

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.