Compute and Use the Degree of Operating Leverage [L05-8] Engberg Company installs lawn sod in home yards. The company's most recent monthly contribution format income statement follows: Compute the company's degree of operating leverage. (Round your answer to 2 decimal places.) Using the degree of operating leverage, estimate the impact on net operating income of a 28% increase in sales (Round your intermediate calculations to 2 decimal places. Round your percentage answer to 2 decimal places (i.e .1234 should be entered as 12.34).)