Departmental Overhead Rates
Diewold Company has two departments, Milling and Assembly. The company uses a job-order costing system and computes a predetermined overhead rate in each department. The Milling Department bases its rate on machine-hours, and the Assembly Department bases its rate on direct labor-hours. At the beginning of the year, the company made the following estimates:
| Department | |
Milling | Assembly | |
Direct labor-hours | 8,000 | 80,000 |
Machine-hours | 60,000 | 3,000 |
Total fixed manufacturing overhead cost | $390,000 | $500,000 |
Variable manufacturing overhead per machine-hour | $2.00 | — |
Variable manufacturing overhead per direct labor-hour | — | $3.75 |
Required:
1. Compute the predetermined overhead rate to be used in each department.
2. Assume that the overhead rates you computed in (1) above are in effect. The job cost sheel for lob 407, which was started and completed during the year, showed the following:
| Department | |
| Milling | Assembly |
Direct labour-hours | 5 | 20 |
Machine-hours | 90 | 4 |
Materials requisitioned | $800 | $370 |
Direct labour cost | $45 | $160 |
Compute the total manufacturing cost assigned to Job 407.
3. Would you expect substantially different amounts of overhead cost to be charged to some jobs if the company used a plantwide overhead rate based on direct labor-hours instead of using departmental rates? Explain. No computations are necessary.
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