QUESTION 4 (25 MARKS) PARTA 18 marks The following four independent cases are presented below: REQUIRED: Calculate the missing values for (a) to (I) in the above scenario. Clearly indicate your answer next to each appropriate letter. Show all your workings. PART B 2 marks Jabulani Consulting provides services to the medical industry. The firm's contribution margin ratio is 0.25, and its annual fixed costs are R2 000000. REQUIRED: 1. Calculate the company's break-even sales revenue. PART C 5 marks Stratford company distributes a lightweight office chair that sells for R150 per unit. Variable costs are R60 per unit, and fixed costs total R1 800000 per annum. REQUIRED: 1. What is the product's contribution margin ratio? 2. Use the contribution margin ratio calculated in (1) above to determine the break-even point in Rands. 3. The company has estimated that sales will increase by R450 000 during the coming year due to an increase in product demand. By how much should net operating income increase