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 $ 45, 000 Variable expenses 31, 500 Contribution margin 13, 500 Fixed expenses 8, 640 Net operating income $ 4,860 15. Assume that the amounts of the company's total variable expenses and total fixed expenses were reversed. In other words, assume that the total variable expenses are $8,640 and the total fixed expenses are $31,500. Using the degree of operating leverage, what is the estimated percent increase in net operating income of a 5% increase in unit sales? (Round your intermediate calculations and final answer to 2 decimal places.) Increase in net operating income %