QUESTION 21 Which of the following best defines the concept of a relevant cost? A future cost that is the same among alternatives A past cost that differs among alternatives. A cost that is based on past experience. A future cost that differs amon alternatives. A past cost that is the same among alternatives. QUESTION 20 The book value of equipment currently owned by a company is an example of a (n): opportunity cost. sunk cost. comparative cost differential cost. future cost