Answer:
$580,000 underapplied
Explanation:
The computation of the ending overhead is shown below:
The applied overhead is
= Predetermined overhead rate × actual machine hours
= $40 × 90,000
= $3,600,000
Now the underapplied overhead is
= $4,180,000 - $3,600,000
= $580,000
So the ending overhead is $580,000 underapplied