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

	Case A	Case B	Case C	Case D
Unit Sales	1,000	800	Answer	Answer
Sales revenue	$20,000	$Answer	$Answer	$60,000
Variable cost per unit	$10	$2	$10	$Answer
Contribution margin	$Answer	$800	$Answer	$Answer
Fixed Costs	$8,100	$Answer	$60,000	$Answer
Net income	$Answer	$600	$Answer	$Answer
Unit contribution margin	$Answer	$Answer	$Answer	$13
Break-even point (units)	Answer	Answer	4,000	2,000
Margin of safety (units)	Answer	Answer	100	1,000