I need answer with explanation please

Glassing Clinic uses client-visits as its measure of activity. During September, the clinic budgeted for 4,000 client-visits but its actual of activity was 3960 client-visits. The clinic has provided the following data concerning the formulas to be used in its budgeting. The activity variance for personnel expenses in September would be closes to $248 U $248 F $716 F $716 U