Answer:
The variable manufacturing overhead efficiency variance is 9,000 Favorable.
Step-by-step explanation:
According to the given data we have the following:
actual DL hours=3,700
standard hours= Actual tubs produced×Standard DL hours per tub
standard hours=1,200×5=6,000
standard rate=$4
Therefore, to calculate the variable manufacturing overhead efficiency variance, we would have to use the following formula:
Variable efficiency variance= (actual hrs - standard hrs)*standard rate
Variable efficiency variance= (3,700 - 6,000)*4
Variable efficiency variance=-$9,000 Favorable