True or False

1. Opportunity costs are costs of producing or selling one more unit of product and added to total costs.
2. Sunk costs are historical or past costs incurred as a result of past decisions and not relevant in current decision making.
3. Target sales dollars is equal to fixed cost plus desired net income after tax divided by contribution margin ratio.
4. Margin of safety is the excess of actual or budgeted sales over the break-even sales.