Gourley Clinic uses client-visits as its measure of activity. During August, the clinic budgeted for 4,000 client-visits, but its actual level of activity was 3,920 client-visits. The clinic has provided the following data concerning the formulas to be used in its budgeting:

	Fixed element per month	Variable element per client-visit
Revenue		$40.60
Personnel expenses	$36,600	$11.80
Medical supplies	2,600	8.60
Occupancy expenses	9,600	2.60
Administrative expenses	6,600	.80
Total expenses	$55,400	$23.80

The activity variance for personnel expenses in August would be closest to:

$944 F$3,384 F$3,384 U$944 U