A company purchased office equipment for $40,000 and estimated a salvage value of $8,000 at the end of its 4-year useful life. The constant percentage to be applied against book value each year if the double-declining-balance method is used is 20%. 25%. 50%. 5%. A machine with a cost of $240,000 has an estimated salvage value of $15,000 and an estimated useful life of 5 years or 15,000 hours. 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? $75,000 $45,000 $65,000 $80,000