Leven Clinic uses client-visits as its measure of activity. During September, the clinic budgeted for 3,000 client-visits, but its actual level of activity was 3,050 client-visits. The clinic has provided the following data concerning the formulas to be used in its budgeting for September Pixed Variable element per element per month client-visit Revenue $0 $31.00 personnel expenses $ 23,900 $10.70 Medical supplies 1,400 3.90 Occupancy expenses 5,700 1.10 Administrative expenses 5,100 0.10 Total expenses $. 36,100 $15.80 The personnel expenses in the planning budget for September would be closest to