An issue is whether the entire $183,000 “annual costs not related to the volume of production” should be treated as product or period expense.
Unless the instructor for some reason is using this case after Chapter 6, the students may not recognize this as an issue or, if they do, not know how to deal with it in the financial statements.
In any event, I think it worthwhile for the instructor to note that these expenses are by definition fixed (do not vary with production volume), but that some (especially a portion of salaries and wages) may be production costs and hence strictly speaking should be used in valuing inventory.
(Students often mistakenly use “fixed costs” and “period costs” as synonyms.)