My only problem here with this question is the required number 2, "Costs of subcontracted work". How do I calculate out this number?

For any answer, thanks a lot, much appreciated.

Pearson Architectural Design began operations on January 2. The following activity was recorded in the company's Work in Process account for the first month of operations:

Work in Process

Costs of subcontracted work 90,000 To completed projects 530,400
Direct staff costs 201,000
Studio overhead 281,400

Pearson Architectural Design is a service firm, so the names of the accounts it uses are different from the names used in manufacturing companies. Costs of Subcontracted Work is comparable to Direct Materials; Direct Staff Costs is the same as Direct Labor; Studio Overhead is the same as Manufacturing Overhead; and Completed Projects is the same as Finished Goods. Apart from the difference in terms, the accounting methods used by the company are identical to the methods used by manufacturing companies.

Pearson Architectural Design uses a job-order costing system and applies studio overhead to Work in Process on the basis of direct staff costs. At the end of January, only one job was still in process. This job (the Krimmer Corporation Headquarters project) had been charged with $13,500 in direct staff costs.

Required:
1.
Compute the predetermined overhead rate that was in use during January.

Predetermined overhead rate %

2.
Complete the following job cost sheet for the partially completed Krimmer Corporation Headquarters project.

Job Cost Sheet
Krimmer Corporation Headquarters Project
As of January 31
Costs of subcontracted work $
Direct staff costs
Studio overhead

Total cost to January 31 $

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