Check m t 13 of 15 Required information (The following information applies to the questions displayed below.] Oslo Company prepared the following contribution format income statement based on a sales volume of 1,000 units (the relevant range of production is 500 units to 1,500 units): ts 04:00:28 Sales Variable expenses Contribution margin Fixed expenses Net operating income $ 25,000 17,500 7,500 4,200 $ 3,300 Print 13. Using the degree of operating leverage, what is the estimated percent increase in net operating income of a 5% increase in sales? (Round your intermediate calculations and final answer to 2 decimal places.) Increase in net operating income %