Zelenka Clinic uses client$-$visits as its measure of activity. During June, the clinic budgeted for $3,000$ client$-$visits, but its actual level of activity was $2,900$ client$-$visits. The clinic has provided the following data concerning the formulas to be used in its budgeting for June:

Fixed element per month

Variable element per client$-$visit

Revenue

$$50\mathrm{.}00$

Personnel expenses

$$35,000$

$$20\mathrm{.}00$

Medical supplies

$1,700$

$6\mathrm{.}00$

Occupancy expenses

$11,000$

$1\mathrm{.}50$

Administrative expenses

$5,000$

$0\mathrm{.}20$

Total expenses

$27\mathrm{.}70$

The net operating income in the planning budget for June would be closest to: