Kirnon Clinic uses client$-$visits as its measure of activity. During July, the clinic budgeted for $4,350$ client$-$visits, but its actual level of activity was $4,400$ client$-$visits. The clinic has provided the following data concerning the formulas to be used in its budgeting:

$\backslash$table$[[,\backslash$table$[[$Fixed element per$],[$month$]],\backslash$table$[[$Variable element$],[$per client$-$visit$]]],[$Revenue$,$$$0,$$$41\mathrm{.}30$