Determine the missing amounts in each of these four separate situations a through d.

	a	b	c	d
Supplies availableprior year-end	$550	$2,915	$2,478
Supplies purchased during the current year	3,850	9,911		10,511
Total supplies available	4,400	12,826
Supplies availablecurrent year-end	1,000		2,958	800
Supplies expense for current year		2,615	19,351	11,086