Please answer all parts

Part 2 Fire Company is a service firm with current service revenue of $900,000 and a 40% contribution margin. Its fixed costs are $200,000. Ice Company has current sales of $420,000 and a 30% contribution margin. Its fixed costs are $90,000. 2. Requirements: 1. Calculate the margin of safety for Fire and Ice (in both sales dollars and percentage). Define and explain the concept of margin of safety. Compare the margin of safety in dollars between the two companies. Which is stronger? 3. Compare the margin of safety in percentage between the two companies. Now which one is stronger? Calculate the degree of operating leverage for both companies. Which company will benefit most from a 10% increase in sales? Explain why. Illustrate your findings in an Income Statement for each company that calculates their net income for their current level of activity and the net income if sales increased by 10% for each company