3.1 Required: Calculate the following: 3.1.1 Break-even quantity. (4) 3.1.2 Break-even value using the marginal income ratio. (3) 3.1.3 Margin of safety (in terms of units). (3) 3.1.4 Expected total marginal income and net profit. (5) INFORMATION Sharpe Ltd manufactures calculators. The following information was extracted from the budget for the year ended 31 December 2017: Sales Selling price per calculator Variable production cost per unit Fixed production costs Variable selling and administrative costs per unit Fixed selling and administrative costs 5 400 units R270 R126 R144 000 R36 R72 000