Answer:
Efficiency variance $645 unfavorable
Step-by-step explanation:
Variable overhead efficiency variance: A variance is the difference between a standard cost and the actual cost. Variable overhead efficiency variance aims to determine whether or not their exist savings or extra cost incurred on variable overhead as a result of workers being faster or slower that expected.
Since the variable overhead is charged using labour hours, any amount by which the actual labour hours differ from the standard allowable hours would result in a variance
To calculate this variance, we do as follows:
Hours
8,200 units should have taken (8,200 × 0.50 hrs) 4,100
but did take 4,250
Variance in hours 150 unfavorable
Standard rate × $4.30
Efficiency variance $645 unfavorable