Williamson Corporation purchased a depreciable asset for $300,000 on January 1, 2012. The estimated residual value is $30,000, and the estimated useful life is 9 years. The straight-line method is used for depreciation. In 2015, Williamson changed its estimates to a total useful life of 5 years with a salvage value of $50,000. What is 2015 depreciation expense?

Select one:

a. $30,000

b. $80,000

c. $50,000

d. $90,000