Co T has depreciated their equipment using sum of the years digit method beginning in January 2017. The original cost of their equipment was $2,200,000 with a salvage value of $100,000. They had elected to depreciate the equipment over 6 years. The Accumulated Depr account has a $1,500,000 balance at the beginning of 2020. In 2020, they now believe a better estimate of useful life is 4 years from January 2020, at which time they believe that a straight-line rate with a salvage of $100,000 would present more fairly and accurately the financial picture of the company. Calculate the amount of depreciation for 2020 and describe the method applied to this new method.