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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): 5 23 Sales Variable expenses Contribution margin Fixed expenses Net operating income $ 70,000 38,500 31,500 23,310 $ 8,190 Required: 1. What is the contribution margin per unit? (Round your answer to 2 decimal places.) Contributon margin par und 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 5. If sales decline to 900 units, what would be the net operating income? Net operating income