Please answer 10,11,12,13

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 $ 20,000 12,000 B,000 6.000 $ 2,000 10. How many units must be sold to achieve a target profit of $5,000? Number of units 11. What is the margin of safety in dollars? What is the margin of safety percentage? Margin of safety in dollars Margin of safety percentage % 12. What is the degree of operating leverage? Degree of operating leverage 13. Using the degree of operating leverage, what is the estimated percent increase in net operating income of a 5% increase in sales? Increase in net operating income