Jiminian Clinic uses client-visits as its measure of activity. During March, the clinic budgeted for 3,700 client-visits, but its actual level of activity was 3,660 client-visits. The clinic has provided the following data concerning the formulas used in its budgeting and its actual results for March: Data used in budgeting:

	Fixed element per month	Variable element per client-visit
Revenue	?	$31.00
Personnel expenses	$35,700	$8.10
Medical supplies	1,800	4.50
Occupancy expenses	8,800	1.10
Administrative expenses	3,900	0.40
Total expenses	$50,200	$14.10

Actual results for March:

Revenue	$115,860
Personnel expenses	$66,226
Medical supplies	$18,810
Occupancy expenses	$12,356
Administrative expenses	$5,224

The medical supplies in the flexible budget for March would be closest to:

$19,016

$18,270

$18,607

$18,450