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): $21,200 12,400 Sales Variable expenses Contribution margin Fixed expenses 8,800 6,952 $ 1,848 Net operating income Required: Using the degree of operating leverage, what is the estimated percent increase in net operating income of a 4% increase in sales?? (Do not round intermediate calculations. Round your answer to 2 decimal places.) Percent increase in net operating income %