Kirnon Clinic uses client-visits as its measure of activity. During July, the clinic budgeted for 2,000 client-visits, but its actual level of activity was 2,010 client-visits. The clinic has provided the following data concerning the formulas to be used in its budgeting: Fixed element per month Variable element per client-visit Revenue - $ 43.70 Personnel expenses $ 26,100 $ 12.10 Medical supplies 1,000 6.30 Occupancy expenses 6,800 1.60 Administrative expenses 3,000 0.20 Total expenses $ 36,900 $ 20.20 The activity variance for personnel expenses in July would be closest to: