=+18-35 KK Recognising cash flows for capital investment projects OBJECTIVES 3, 8 Trinh Tran is a dentist and is thinking of replacing the X-ray machine. The X-ray machine has a historical cost of $135000 and accumulated depreciation of $135000, but has a trade-in value of $15000. It currently costs $1500 per month in utilities and another $10500 a year in maintenance to run the X-ray machine. Trinh feels that the old X-ray machine can be used for another five years, after which it would have no salvage value.