Bartosiewicz Clinic uses client-visits as its measure of activity. During January, the clinic budgeted for 5,200 client-visits, but its actual level of activity was 5,220 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 variable element element per per month client-visit $37.20 Revenue Personnel expenses Medical supplies Occupancy expenses Administrative expenses Total expenses $29,200 1,500 10,200 6,700 $ 47,600 $13.20 7.20 1.00 0.30 $21.70 Actual results for January: Revenue $ 150, 200 Personnel expenses $ 70,080 Medical supplies $ 20,224 Occupancy expenses $ 14,090 Administrative expenses $ 7,570 Actual results for January: Revenue $150,200 Personnel expenses $ 70,080 Medical supplies $ 20,224 Occupancy expenses $ 14,090 Administrative expenses $ 7,570 The activity variance for net operating income in January would be closest to