A company purchased a plant asset for $45,000. It has a salvage value of $5,000 and a useful life of 8 years. It calculates depreciation using the straight-line method. The balance of the company's Accumulated Depreciation account at the end of the current year after-adjusting entries is $25,000. What is the asset's remaining useful life? 8 years O 3 years O 5 years 10 years O 6 years