Please help! And please explain how to get answers so I can learn how to do it on future problems. Thanks in advance! I'll be sure to give a thumbs up.

Engberg Company installs lawn sod in home yards. The company's most recent monthly contribution format income statement follows: Sales Variable expenses Amount $ 149,000 59,600 Percent of Sales 100% 40% 60% Contribution margin Fixed expenses 89,400 18,000 Net operating income $ 71,400 Required: 1. Compute the company's degree of operating leverage. (Round your answer to 2 decimal places.) Degree of operating leverage 2. 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).) Net operating income by 3. Construct a new contribution format income statement for the company assuming a 28% increase in sales Engberg Company Contribution Income Statement Total