A plant asset was purchased on January 1 for $75,000 with an estimated salvage value of $15,000 at the end of its useful life. The current year's Depreciation Expense is $5,000 calculated on the straight-line basis and the balance of the Accumulated Depreciation account at the end of the year is $25,000. The remaining useful life of the plant asset is A) 15 years. B) 12 years. C) 5 years. D) 7 years. 15. A machine with a cost of $480,000 has an estimated salvage value of $30,000 and an estimated useful life of 5 years or 15,000 hour. It is to be depreciated using the units-of- activity method of depreciation. What is the amount of depreciation for the second full year, during which the machine was used 5,000 hours? A) $150,000 B) $90,000 C) $130,000 D) $160,000