Tennies Clinic uses client$-$visits as its measure of activity. During November, the clinic budgeted for $3,400$ client$-$visits, but its actual level of activity was $3,390$ client$-$visits. The clinic has provided the following data concerning the formulas used in its budgeting and its actual results for November:

Data used in budgeting:

$\backslash$table$[[,$Fixed element$],[$per month,per cliable element,$],[$Revenue$,$$$0,$$$35\mathrm{.}60$