Answer:
The answer is: The predetermined overhead rate is $10 per machine hour.
Explanation:
We must first determine the total overhead cost:
total overhead = fixed overhead cost + (variable overhead x machine hours)
total overhead = $300,000 + ($4 x 50,000) = $500,000
To get the predetermined overhead cost we divide the total overhead cost over the estimated machine hours.
Predetermined overhead cost = $500,000 / 50,000 = $10 per machine hour
