! 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 Net operating income $ 60,000 39,000 21,000 14,700 $ 6,300 Required: 1. What is the contribution margin per unit? (Round your answer to 2 decimal places.) Contribution margin per unit 2. What is the contribution margin ratio? Contribution margin ratio % 3. What is the variable expense ratio? Variable expense ratio % 4. If sales increase to 1,001 units, what would be the increase in net operating income? (Round your answer to 2 decimal places.) Increase in net operating income