Answer:
Variable overheads efficiency variance = $13,040 favorable
Explanation:
Variable overheads efficiency variance is the difference between the standard hours of actual output and actual hours valued at the standard variable overhead rate per hour
Hours
5,900munits should have taken (5,900× 0.9) 5,310
but did take 2050
efficiency variance in hours 3,260 favorable
Standard rate per hour $4.00
Variable overheads efficiency variance 13,040 favorable
Variable overheads efficiency variance = $13,040 favorable