Hoover Corporation purchased equipment on January 1, 2019, for $610,000. In 2019 and 2020, Hoover depreciated the asset on a straight-line basis with an estimated useful life of 8 years and a $10,000 residual valie. In 2021, due to changes in technology, Hoover revised the useful life to a total of four years with no residual value. What depreciation would Hoover record for the year 2021 on this equipment?

a) $98,641

b) 230,000

c)100,000

d)72,000