please answer all the questions, i am not sure my is correct. thanks a lot

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): 95,000 57,000 Sales Variable expenses Contribution margin Fixed expenses Net operating income 31,920 $ 6,080 2. What is the contribution margin ratio? ontribution margin ratio 40 %