Bartosiewicz Clinic uses client-visits as its measure of activity. During January, the clinic budgeted for 5,000 client-visits, but its actual level of activity was 5,020 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		-		$	37.00
Personnel expenses	$	29,000		$	13.00
Medical supplies		1,900			7.00
Occupancy expenses		10,900			1.00
Administrative expenses		6,500			0.10
Total expenses	$	48,300		$	21.10

Actual results for January:

Revenue	$	150,000
Personnel expenses	$	70,060
Medical supplies	$	20,220
Occupancy expenses	$	14,070
Administrative expenses	$	7,550

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