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: