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): Sales % 95,888 Variable expenses 57,808 Contribution margin 38,000 Fixed expenses 31,928 Net operating income $ 6,888 13. Using the degree of operating leverage, what is the estimated percent increase in net operating income that would result from a 5% increase in unit sales? (Round your intermediate calculations and final answer to 2 decimal places.)