Engberg Company installs lawn sod in home yards. The company's most recent monthly contribution format income statement follows Percent of Sales 100% 40% 60 Amount Sales Variable expenses Contribution margin Fixed expenses Net operating income 144,000 57,600 86, 400 22,000 S 64, 400 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 26% increase in sales 3-Construct a new contribution format income statement for the company assuming a 26% increase in sales