Paradiso Medical Clinic measures its activity in terms of patient-visits. Last month, the budgeted level of activity was 1, 150 patient-visits and the actual level of activity was 1, 140 patient-visits. The cost formula for administrative expenses is $3.90 per patient-visit plus $21, 500 per month. The actual administrative expense was $22,000. In the clinic's flexible budget performance report for last month, the spending variance for administrative expenses was: $3, 946 F $1, 570 U $39 F $3, 985 F