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 24,200 13,400 10,800 7,668 3,132 $ Required: What is the variable expense ratio? (Round your answer to 2 decimal placet.) Variable expense ratio %