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 $2,000$ tenant$-$days, but its actual level of activity was $2,040$ 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:

$\backslash$table$[[,\backslash$table$[[$Fixed$],[$element$],[$per month$]],\backslash$table$[[$Variable$],[$element per$],[$tenant$-$day$]]],[$Revenue $-,0,$$$35\mathrm{.}40$