1. Total fixed costs change as the level of activity changes. true or false?

2. Variable costs are costs that remain constant on a per-unit basis as the level of activity changes. true or false?

3. Variable costs as a percentage of sales are equal to 100% minus the contribution margin ratio. true or false

4. The data required for determining the break-even point for a business are the total estimated fixed costs for a period stated as a percentage of sales.true or false