Answer:
See below
Explanation:
Given the following;
Standard hours per unit of output 6.4 hours
Standard variable overhead rate $12.80 per hour
Actual hours 2,650 hours
Actual output 150 units
To calculate the variable overhead efficiency variance, we will use the formula below;
Variable overhead efficiency variance
= (Standard quantity - Actual quantity) × Standard rate
Standard quantity = 150 units × 6.4 = 960
Variable overhead efficiency variance
= (960 - 2,650) × $12.80
= $21,632 unfavourable