Required information The Foundational 15 (LO6-1, LO6-3, L06-4, LO6-5, L06-6, LO6-7, LO6-8) [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 Variable expenses Contribution margin Pixed expenses Net operating income $ 20,000 12,000 8,000 6,000 $ 2,000 Foundational 6-15 15. Asume 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 $6,000 and the total fixed expenses are $12,000. 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 5% increase in sales? Increase in net operating income