Jason Corp. manufactures calculators. Each calculator sells for $20. Costs are as follows: Variable production costs Variable marketing costs Fixed production costs Fixed marketing costs $10 per unit $4 per unit $27,000 per year $30,000 per year If the firm currently sells 15,000 calculators each year, its margin of safety (in units) is: 5,500 units 9,300 units 10,500 units There is no correct answer 12,300 units