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 $ 20,900 Variable expenses 12,300 Contribution margin 8,600 Fixed expenses 6,708 Net operating income $ 1,892 Required: a. What is the margin of safety in dollars? (Do not round intermediate calculations.) b. What is the margin of safety percentage?