Enter the missing dollar amounts for the income statement for each of the following independent cases:

cases	sales revune	beginning inventory	purchases	total avaiable	ending inventory	cost of goods sold	gross profit	expenses	pretax income (loss)
a	$650	$100	$700		$500			$200
b	1,100	200	900					150	150
c		150			300	200	400	100
d	800		550		300			200	200
e	1,000		900	1,100			500		(50)