PLEASE HELP ME ON THIS QUESTION!!

Paulis 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 February, the kennel budgeted for $4,600$ tenant$-$days, but its actual level of activity was $4,580$ tenant$-$days. The kennel has provided the following data concerning the formulas used in its budgeting and its actual results for February: