Engberg Company installs lawn sod in home yards. The company's most recent monthly contribution format income statement follows: Percent of Amount Sales Sales $ 123, 000 100% Variable expenses 49, 200 40% Contribution margin 73,800 60% Fixed expenses 18, 000 Net operating income $ 55,800 Required: 1. What is the company's degree of operating leverage? 2. Using the degree of operating leverage, estimate the impact on net operating income of a 25% increase in sales. 3. Construct a new contribution format income statement for the company assuming a 25% increase in sales. ces Complete this question by entering your answers in the tabs below. Required 1 Required 2 Required 3 Construct a new contribution format income statement for the company assuming a 25% increase in sales. Engberg Company Contribution Income Statement Amount Percent of Sales Sales % Variable expenses % Contribution margin 0 0 % Fixed expenses Net operating income $ 0