Engberg Company installs lawn sod in home yards. The company's most recent monthly contribution format income statement follows: Percent of Sales 100 ter Amount $ 136,00 54,400 81,600 21.000 $ 60,600 Sales Variable expenses Contribution margin Fixed expenses Net operating income 6ex 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 11% increase in sales. 3. Construct a new contribution format income statement for the company assuming a 11% increase in sales