3. 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. a. Compute 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 that is increased by 10%