Rhed Kennel uses tenant-days as its measure of activity; an animal housed in the kennel for one day is counted as one tenant-day. During December, the kennel budgeted for 4,550 tenant-days, but its actual level of activity was 4,500 tenant-days. The kennel has provided the following data concerning the formulas used in its budgeting and its actual results for December: Data used in budgeting: Fixed Variable element element per per month tenant-day - $35.60 Revenue Wages and salaries Food and supplies Facility expenses Administrative expenses Total expenses $ 3,900 2,250 9,900 7,900 $23,950 $ 9.40 14.60 6.10 0.70 $30.80 Actual results for December: Revenue Wages and salaries Food and supplies Facility expenses Administrative expenses $159,355 $ 46,485 $ 66,835 $ 37,535 $ 9,865 Actual results for December: Revenue Wages and salaries Food and supplies Facility expenses Administrative expenses $ 159, 355 $ 46,485 $ 66,835 $ 37,535 $ 9,865 The activity variance for administrative expenses in December would be closest to