Acompany wants to determine the annual opportunity cost of using equipment it owns and has already paid for. which of the following would not be useful for that purpose? a. the amount the company originally paid to purchase the equipment. b. the amount for which the equipment could be rented to another company during the year. c. the profit the company could earn during the year by employing the equipment in some other use. d. the estimated market value of the equipment at the beginning of the year and at the end of the year.