Answer:
Manufacturing overhead for the month was under-applied by $21,000.
Step-by-step explanation:
As for the information provided, it is clear that:
Expected and budgeted overheads were $79,000 that is actual overheads incurred, but from $79,000 of overheads, the overheads actually charged in the period as cost of goods sold = $58,000
That means the overheads are under-applied by the difference in actual overheads incurred and those charged to cost of goods sold = $79,000 - $58,000 = $21,000
That is overheads are under-applied by $21,000