This question has five parts $(3$ points per part$).$ Hartwick Clinic uses client$-$visits as its measure of activity. During April, the clinic budgeted for $4,000$ client$-$visits, but actual level of activity was $3,850$ client$-$visits. The clinic has provided data concerning the formulas used in its budgeting and its actual results for April:

Data used in budgeting:

$\backslash$table$[[,$Fixed $ per month,Variable $ per client$-$visit$],[$Revenue$,,$$$23\mathrm{.}60$