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 $ 143,000 57,200 85,800 20,000 $ 65,800 Sales Variable expenses Contribution margin Fixed expenses Net operating income 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 28% increase in sales. 3. Construct a new contribution format income statement for the company assuming a 28% increase in sales. Answer is complete but not entirely correct. 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 28% increase in sales. Engberg Company Contribution Income Statement Amount Sales Variable expenses Contribution margin Fixed expenses Net operating income 183,040 73,216 109,824 20,000 $ 89,824 Percent of Sales 128 X 68 % 60 % l