The predetermined overhead rate if Barr bases the rate on direct labor hours is 10 per hour.
Using this formula
Predetermined overhead rate=Estimated overhead/Estimated production labor hours
Where:
Estimated overhead=$900,000
Estimated production=90,000 labor hours
Let plug in the formula
Predetermined overhead rate= $900,000 / 90,000
Predetermined overhead rate= 10 per hour
Inconclusion the predetermined overhead rate if Barr bases the rate on direct labor hours is 10 per hour.
Learn more about predetermined overhead rate here:https://brainly.com/question/26372929