How do multiple production department and the single plantwide factory overhead rate method differ? (Chapter 18)

How does activity-based costing differ from the multiple production department factory overhead rate method? (Chapter 18)

Describe how total variable costs and unit variable costs behave with changes in the level of activity. (Chapter 20)

Which of the following costs would be classified as variable and which would be classified as fixed, if units produced is the activity base? (Chapter 20)

Direct material costs

Electricity costs of $.35 per kilowatt-hour

In applying the high-low method of cost estimation to mixed costs, how is the total fixed cost estimated?