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 $ 85, 000 Variable expenses 59, 500 Contribution margin 25 , 500 Fixed expenses 20, 400 Net operating income $ 5, 100 Required: . What is the contribution margin ratio? Contribution margin ratio %