The three most common cost behavior classi ficati ons are a. variable costs, product costs, and sunk costs b. fixed costs, variable costs, and mixed costs c. variable costs, period costs, and differential costs d. variable costs, sunk costs, and opportunity costs 1. 2. Costs that remain constant in total dollar amount as the level of activity changes are called: a. fixed costs b. mixed costs c. opportunity costs d. variable costs 3. Which of the following costs is an example of a cost that remains the same in total as the number of units produced changes? a. Direct labor b. Salary of a factory supervisor c. Units of production depreciation on factory equipment d. Direct materials 4. Which of the following describes the behavior of the variable cost per unit? a. Varies in increasing proportion with changes in the activity level b. Varies in decreasing proportion with changes in the activity level c. Remains constant with changes in the activity level d. Varies in direct proportion with the activity level 5. A cost that has characteristics of both a variable cost and a fixed cost is called a a. variable/fixed cost b. mixed cost c. discretionary cost d. sunk cost 6. Contribution margin is: a. the excess of sal es revenue over variable cost b. c. d. another term for volume in the "cost-volume-profit" analysis profit the same as sal es revenue 7. The contribution margin ratio is: a. b. c. d. the same as the variable cost ratio the same as profit the portion of equity contributed by the stockholders the same as the profit-vol ume ratio