5 es 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 Variable expenses Contribution margin Fixed expenses Operating income $ 20,000 12,000 Increase in operating income 8,000 6,000 $ 2,000 4. If sales increase to 1,001 units, what would be the increase in operating income? Chec