1. The marginal costing operating statement of AAT Limited for the year just ended is as follows: RM Sales (5,000 units at RM4 per unit) 20,000 (-) Variable costs (direct materials, direct labour, etc.) 8,000 Contribution Margin 12,000 (-) Fixed cost 7,500 Profit 4,500 Required: a. Calculate the break-even point. b. Calculate the margin of safety