Leist Clinic uses client-visits as its measure of activity. During September, the clinic budgeted for 2,200 client-visits, but its actual level of activity was 2,170 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 - $ 50.80 Personnel expenses $ 26,600 $ 15.60 Medical supplies 1,400 9.40 Occupancy expenses 7,600 2.40 Administrative expenses 5,300 0.10 Total expenses $ 40,900 $ 27.50 The medical supplies in the flexible budget for September would be closest to: