Dinham 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 March, the kennel budgeted for 4,600 tenant-days, but its actual level of activity was 4,670 tenant-days. The kennel has provided the following data concerning the formulas used in its budgeting and its actual results for March: Data used in budgeting: Fixed element per month Variable element per tenant-day