Answer:
c. $1,440 Unfavorable
Step-by-step explanation:
Variable overhead efficiency variance = (Standard hours - Actual working hours) * Standard Rate
Variable overhead efficiency variance = ($4,190 hours - $4,350 hours)*($37,800/4,200 hours)
Variable overhead efficiency variance = ($4,190 hours - $4,350 hours)*$9 per hour
Variable overhead efficiency variance = 160 hours*$9 per hour
Variable overhead efficiency variance = $1,440 Unfavorable