15. please help

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 Variable expenses Contribution margin Fixed expenses Net operating income $ 40,000 26,000 14,000 8,689 $ 5,320 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 $8,680 and the total fixed expenses are $26,000. Given this scenario and assuming that total sales remain the same. Using the degree of calculated operating leverage, what is the estimated percent increase in net operating income of a increase in sales? (Round your intermediate calculations and final answer to 2 decimal places.) Increase in net operating Income %