Ch 21 Part 12 of 12 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) 02:42 $ 20,00 12.000 Print Sales Variable expenses Contribution margin Fixed expenses Net operating income 6,000 $ 2,000 13. Using the degree of operating leverage, what is the estimated percent increase in net operating income of a 5% increase in sales? Increase in net operating income ME w