Engberg Company installs lawn sod in home yards. The company’s most recent monthly contribution format income statement follows: Amount Percent of Sales Sales $ 80,000 100 % Variable expenses 32,000 40 % Contribution margin 48,000 60 % Fixed expenses 38,000 Net operating income $ 10,000 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 5% increase in unit sales. 3. Construct a new contribution format income statement for the company assuming a 5% increase in unit sales.