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 $45,000 31,500 13,500 8,640 $4,860 Foundational 5-2 (Algo) 2. What is the contribution margin ratio? Contribution margin ratio %