Gerhan Company's flexible budget for the units actually manufactured in May shows $15,640 of total factory overhead; this output level represents 70% of available capacity. During May the company applied overhead to production at the rate of $3.00 per direct labor hour (DLH), based on a denominator volume level of 6,120 DLHs, which represents 90% of available capacity. The company used 5,000 DLHs and incurred $16,500 of total factory overhead cost during May, including $6,800 for fixed factory overhead. What is the factory overhead production-volume variance for Gerhan Company in May?

$180 unfavorable.

$380 unfavorable.

$680 unfavorable.

$860 unfavorable.

$1,360 unfavorable.