Following are data from 4 separate companies. Supply the missing data in each independent case.

	Case A	Case B	Case C	Case D
sales revenue	120,000	80000	answer	answer
contribution margin	$60,000	answer	20000	answer
fixed costs	$30,000	answer	answer	answer
net income	answer	$5,000	10000	answer
variable cost ratio	answer	0.50	answer	0.20
contribution margin ratio	answer	answer	0.40	answer
break even point	answer	answer	answer	$25,000
margin of safety	answer	answer	answer	20,000