Tennies Clinic uses client-visits as its measure of activity. During November, the clinic budgeted for 3,950 client-visits, but its actual level of activity was 3,940 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 $ 0 $ 36.70 Personnel expenses $ 30,800 $ 11.70 Medical supplies 1,850 7.10 Occupancy expenses 8,900 3.2