Texann Co. has the following factory overhead costs:

Standard overhead applied to this period's production	$72,000
Flexible budget for overhead based on output (i.e. units produced)	$65,000
Total budgeted overhead in the master (static) budget	$86,000
Actual total overhead cost incurred during the period	$76,000

The factory overhead production volume variance for Texann Co. this period is favorable, and the amount is: