Tennies Clinic uses client-visits as its measure of activity. During November, the clinic budgeted for 4,300 client-visits, but its actual level of activity was 4,290 client-visits. The clinic has provided the following data concerning the formulas used in its budgeting and its actual results for November:

Data used in budgeting:

Fixed element per month Variable element per client-visit Revenue - $ 37.40 Personnel expenses $ 31,500 $ 12.40 Medical supplies 2,200 7.80 Occupancy expenses 9,600 3.90 Administrative expenses 7,900 0.40 Total expenses $ 51,200 $ 24.50

Actual results for November:

Revenue $ 160,661 Personnel expenses $ 84,652 Medical supplies $ 36,512 Occupancy expenses $ 25,831 Administrative expenses $ 9,367

The activity variance for personnel expenses in November would be