Final answer:
The actual indirect materials costs incurred by Dream House Builders, Inc. in January were $550. This figure is as recorded by their material requisitions and reflects the indirect costs associated with running their business operations.
Step-by-step explanation:
The amount of actual indirect materials costs incurred by Dream House Builders, Inc. during January was $550. This is directly given in the question, as supported by materials requisitions. Indirect materials are part of the overhead costs that cannot be directly attributed to a single project but are necessary for the overall operation of the business.
In a similar case for calculative reference, if a firm had sales revenue of $1 million and it spent $600,000 on labor, $150,000 on capital and $200,000 on materials, its accounting profit would be the sales revenue minus these expenses. For this firm, that would be $1,000,000 - ($600,000 + $150,000 + $200,000) = $50,000. Hence, the firm's accounting profit would be $50,000.