On January 1, 2017, Bosco Co. purchased a machine for $792,000 and depreciated it by the straight-line method using an estimated useful life of eight years with no salvage value. On January 1, 2020, Bosco determined that the machine had a useful life of six years from the date of acquisition and will have a salvage value of $72,000. An accounting change was made in 2020. The accumulated depreciation for this machine should have a balance at December 31, 2020 of O $480,000. O $528,000. O $438,000. O $462,000