Part II workout Core Company accumulates the following data concerning a mixed cost, using units produced as the activity level. Unit sales Sales revenue Variable cost per unit Contribution margin Fixed costs. Net income Unit contribution margin Break-even point (units) Margin of safety (units) .. . ... Case 1 1,000 $20,000 $10 ? $8,000 ? Case 2 800 $1 $800 ? $400 me statement? 222 Case 3 ? ? $12 $80,000 ? ? 4,000 300 Case 4 $60,000 ? ? ? ? $15 2,000 1,00