Bartosiewicz Clinic uses client-visits as its measure of activity. During January, the clinic budgeted for 4,200 client-visits, but its actual level of activity was 4,180 client-visits. The clinic has provided the following data concerning the formulas used in its budgeting and its actual results for January:

Data used in budgeting:

	Fixed element per month			Variable element per client-visit
Revenue		-		$	36.20
Personnel expenses	$	28,200		$	12.20
Medical supplies		1,100			6.20
Occupancy expenses		10,100			1.00
Administrative expenses		7,200			0.30
Total expenses	$	46,600		$	19.70

Actual results for January:

Revenue	$	126,350
Personnel expenses	$	70,120
Medical supplies	$	21,112
Occupancy expenses	$	14,110
Administrative expenses	$	7,870

The activity variance for net operating income in January would be closest to: