Question 3 (10 marks) Korona Company developed the following information for the product it sells: Sales price 550 per unit Direct materials S15 per unit Direct labour S5 per unit Variable manufacturing overhead $8 per unit Fixed manufacturing overhead S550.0XX Variable selling expense 10% of sales price Fixed selling expense $500,000 Variable administrative expense S2 per unit Fixed administrative expense $300,000 For the year ended 31 December 2019, Korona Company produced and sold 100.000 units of product. Required: (a) Calculate the unit production cost under variable costing and absorption costing. (2 marks) (b) The marketing manager proposed to the President of Korona Company to introduce sales commissions of S3 per unit as an incentive for the sales staff. In exchange, the sales staff would accept an overall decrease in their salaries of $35,000 per month. The marketing manager predicts that introducing this sales incentive would increase annual sales by 2.400 units. Prepare contribution format variable costing income statements for Korona Company to show the overall effect on the company's net operating income before and after the adoption of the proposal