a. JD 90,000 9. Williamson Corporation purchased a depreciable asset for JD 300,000 on January 1, 2012. The estimated residual value is JD 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 JD 50,000. What is 2015 depreciation expense? a. JD 30,000 b.JD 50,000 JD 80,000 d.JD 90,000