On January 1, 2012, Benson Company purchased a machine for $1,200,000 and depreciated it by the straight-line method with an estimated list of ten years and a salvage value of $100,000. On January 1, 2017 Benson determined that the machine had a useful life of eight years from the date of acquisition and will have a salvage value of $200,000. An accounting change was made in 2017 to reflect these additional data. What is the accumulated depreciation credit balance for this machine as of December 31, 2017?