A plant asset was purchased on January 1 for $55000 with an estimated salvage value of $5000 at the end of its useful life. The current year's depreciation expense is $5000 calculated on the straight-line basis and the balance of the Accumulated Depreciation account at the end of the year is $25000. The remaining useful life of the plant asset isa. 6 years.b.11 years.c. 5 years.d. 10 years