Nanki Corporation purchased equipment on January 1, 2019, for $647,000. In 2019 and 2020, Nanki depreciated the asset on a straight-line basis with an estimated useful life of eight years and a $15,000 residual value. In 2021, due to changes in technology, Nanki revised the useful life to a total of four years with no residual value. What depreciation would Nanki record for the year 2021 on this equipment?