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: Percent of Amount $141,000 Sales 56,400 84,600 100% 40 60% 23,000 $ 61,600 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 29% increase in unit sales. 3. Construct a new contribution format income statement for the company assuming a 29% increase in unit sales.