true or false

1. Fixed costs remains unchanged in amount when the volume of activity varies from period to period within a relevant range. 2. The margin of safety can be expressed in units of product, in dollars, or as a percent of sales. 3. Product costs can be classified as as three types: direct materials, direct labor, or overhead. 4. Selling and administrative expenses are normally product costs. 5. When materials are used as indirect materials, their cost is credited to the Factory Overhead account. 6. Contribution margin is the amount of sales that exceeds total variable costs. 7. Breakeven point is the point at which the company occur a loss not a gain 8. A sunk cost has already been incurred and cannot be avoided or changed, so it is irrelevant to decision making. 9. Job order production systems would be appropriate for companies that produce custom homes, specialized equipment, and special computer systems. 10. Job order costing is applicable to manufacturing firms only and not service firms