Answer:
$580,000 under applied.
Step-by-step explanation:
The computation of the company's year end overhead is seen below;
The applied overhead is
= Predetermined overhead rate × actual machine hours
= $40 × 90,000
= $3,600,000
Then, the applied overhead
= $4,180,000 - $3,600,000
= $580,000
Hence, the ending overhead is $580,000 under applied