A machine which cost $500,000 is acquired on October 1, 2017. Its estimated salvage value is $50,000 and its expected life is eight years. Calculate depreciation expense for 2017 and 2018 by double-declining balance. 17 2018 Depreciation expense ? Calculate depreciation expense for 2017 and 2018 by sum-of-the-years'-digits. 2017 2018 Depreciation expense At the end of 2018, which method results in the larger accumulated depreciation amount