5 Nile plc has the following cost structure for 3 years: Units produced Units in beginning stock Units sold Units in ending stock Selling price per unit Variable cost per unit: Direct materials Direct Labour Variable manufacturing overhead Year 1 10,000 Year 2 25,000 Year 3 5,000 0 ? ? 5,000 25,000 10,000 ? ? ? 60 84243 Variable selling and admin 1 expenses Fixed costs per year: Fixed manufacturing overhead 50,000 Fixed selling and admin 20,000 expenses Additional information for the second year: Return on Investment Operating profit Average Operating Assets 3% 900,000 18,750,000 REQUIRED a. Prepare a profit and loss account for each year using the Absorption costing method. (7 marks) b. Prepare a profit and loss account for each year using the contribution margin format. (7 marks)