Kirnon clinic uses client-visits as its measure of activity. during july, the clinic budgeted for 2,000 client-visits, but its actual level of activity was 2,010 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 - $ 43.70 personnel expenses $ 26,100 $ 12.10 medical supplies 1,000 6.30 occupancy expenses 6,800 1.60 administrative expenses 3,000 0.20 total expenses $ 36,900 $ 20.20 the activity variance for personnel expenses in july would be closest to: multiple choice $901 f $901 u $121 f $121 u