Engberg Company installs lawn sod in home yards. The companys most recent monthly contribution format income statement follows: Amount Percent of Sales Sales $ 92,000 100% Variable expenses 36,800 40 Contribution margin 55,200 60% Fixed expenses 44,160 Net operating income $ 11,040 Required: 1. What is the companys degree of operating leverage? 2. Using the degree of operating leverage, estimate the impact on net operating income of a 7% increase in unit sales. 3. Construct a new contribution format income statement for the company assuming a 7% increase in unit sales