Engberg Company installs lawn sod in home yards. The company's most recent monthly contribution format income statement follows: Sales Variable expenses Contribution margin Fixed expenses Net operating income Required: Amount Percent of Sales $ 139,000 55,600 83,400 100% 40 60% 17,000 $ 66,400 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 15% increase in unit sales. 3. Construct a new contribution format income statement for the company assuming a 15% increase in unit sales. 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 15% increase in unit sales. Engberg Company Contribution Income Statement Sales Amount Percent of Sales % % 0 0% Variable expenses Contribution margin Fixed expenses Net operating income $ 0 < Required 2 Required 3 >