Question

The Gilster Company, a machine tooling firm, has several plants. One plant, located in St. Falls, Minnesota, uses a job order costing system for its batch production processes. The St. Falls plant has two departments through which most jobs pass. Plantwide overhead, which includes the plant manager’s salary, accounting personnel, cafeteria, and human resources, is budgeted at $200,000. During the past year, actual plantwide overhead was $185,000. Each department’s overhead consists primarily of depreciation and other machine-related expenses. Selected budgeted and actual data from the St. Falls plant for the past year are as follows.

	Department A				Department B
Budgeted department overhead
(excludes plantwide overhead)	$	196,000			$	559,000
Actual department overhead		142,000				574,000
Expected total activity:
Direct labor hours		36,000				10,000
Machine-hours		14,000				43,000
Actual activity:
Direct labor hours		38,500				9,400
Machine-hours		14,500				45,000

For the coming year, the accountants at St. Falls are in the process of helping the sales force create bids for several jobs. Projected data pertaining only to job no. 110 are as follows.

Direct materials	$	16,500
Direct labor cost:
Department A (2,000 hr)		30,000
Department B (500 hr)		10,000
Machine-hours projected:
Department A		140
Department B		1,200
Units produced		10,000

Assume the St. Falls plant uses three separate overhead rates to assign overhead costs to jobs.

b-1. Find the plant wide overhead rate by using expected machine hours.

b-2. Find the department overhead rate using expected machine hours for Department A and Department B.

b-2. Calculate the projected manufacturing costs for job 110 using the three separate rates computed in b-1 and b-2.

Answer 1

b1.

Plant wide overhead rate = Budgeted plant wide overhead / Expected machine hours

Plant wide overhead rate = $200,000 / 57,000 (14,000+43,000) = $3.50877 per machine hour

b2.

Department overhead rate = Budgeted department overhead / Expected machine hours

Department A = $196,000 / 14,000 = $14 per machine hour

Department B = $559,000 / 43,000 = $13 per machine hour

	Job 110
Direct materials		$16,500
Direct labor
Department A	$30,000
Department B	10,000	40,000
Applied overhead
Department A [$491(140*$3.50877)+1,960(140*$14)	2,451
Department B [$4,211(1200*$3.50877)+15600(1200*$13)	19,811	22,262
Total manufacturing costs		$78,762