Can you please help with the whole question

Aldova Company produces a variety of chemicals. One division makes reagents for laboratories. The division's projected income statement for the coming year is: R1 632 000 Sales (204 000 units @ R8 Total variable costs Contribution margin Total fixed costs Operating income R1 020 000 R 612 000 R 494 550 R 117 450 Required: 4.1 Calculate the margin of safety revenues. 4.2 Calculate the degree the degree of operating leverage based on the original income statement. (Round off to two decimal places.) 4.3 If sales revenues are 8% more than expected, calculate the percentage increase in operating income