Supply the missing data in each independent case. Case 1 Case 2 Case 3 Case 4 Case 5 Unit sales 700 300 ? ? ? Sales revenue R42 000 ? ? R58 000 R40 000 Variable cost per unit R 45 R 1 R 15 ? ? Contribution Margin ? R1 200 ? ? R10 000 Fixed costs R7 500 ? R60 000 ? ? Operating income ? R 100 ? ? ? Unit contribution margin ? ? ? R 1 R 2 Break-even point (units) ? ? 5 000 30 000 ? Margin of Safety ? ? 1 000 -1 000 600