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 Variable element element per per month client-visit $36.20 Revenue Personnel expenses Medical supplies Occupancy expenses Administrative expenses Total expenses $28, 200 1,100 10,100 7,200 $46,600 $12.20 6.20 1.00 8.30 $19.70 Actual results for January Revenue Personnel expenses Medical supplies Occupancy expenses Administrative expenses $126, 350 $ 70,120 $ 21,112 $ 14,110 $ 7,870 The activity variance for net operating income in January would be closest to: Multiple Choice O $9,562 U O $330 F $9,562 F O $330 U