Galante Kennel uses tenant-days as its measure of activity; an animal housed in the kennel for one day is counted as one tenant-day. During May, the Kennel budgeted for 3,400 tenant-days, but its actual level of activity was 3,380 tenant-days. The Kennel has provided the following data concerning the formulas used in its budgeting and its actual results for May:

Data used in budgeting:

	Fixed element per month	Variable element pertenant-day
Revenue		$29.90
Wages and salaries	$2,400	$5.90
Expendables	600	10.70
Facility expenses	7,400	2.90
Administrative expenses	7,200	0.50
Total expenses	$17,600	$20.00

Actual results for May:

Revenue	$107,180
Wages and salaries	$23,440
Expendables	$36,784
Facility expenses	$19,190
Administrative expenses	$9,128

The net operating income in the flexible budget for May would be closest to:

$15,862$18,638$16,060$18,544