Bartosiewicz Clinic uses client-visits as its measure of activity. During January, the clinic budgeted for 3,900 client-visits, but its actual level of activity was 3,880 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	$ 0	$ 35.90
Personnel expenses	$ 27,900	$ 11.90
Medical supplies	1,900	5.90
Occupancy expenses	10,900	1.00
Administrative expenses	6,900	0.50
Total expenses	$ 47,600	$ 19.30

Actual results for January:

Revenue	$ 124,740
Personnel expenses	$ 71,010
Medical supplies	$ 22,300
Occupancy expenses	$ 14,690
Administrative expenses	$ 8,195

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