The amount of overhead allocated to a job that used 300 direct labor hours is $900.
Overhead allocated:
First step is to calculate the predetermined overhead rate per direct labor hour
Using this formula
Predetermined overhead rate=Estimated manufacturing overhead/Estimated direct labor hours
Predetermined overhead rate=$450,000/150,000
Second step is to calculate the overhead allocated
Overhead allocated=Predetermined overhead rate × Direct labor hours
Overhead allocated=$3×300
Overhead allocated=$900
Inconclusion the amount of overhead allocated to a job that used 300 direct labor hours is $900.
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