Suburban Landscape provides landscaping design and installation for residential and commercial properties. The company's recent annual contribution format income statement follows: Sales Variable expenses Contribution margin Fixed expenses Net operating income Amount $ 150,000 60,000 90,000 21,000 $ 69,000 Percent of Sales 100% 40% 60% 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 13% increase in sales. 3. Construct a new contribution format income statement for the company assuming a 13% increase in sales