9. On January 1, Year 7, Nathan Inc. purchased a machine for $56,000. Eight-year, straight-line depreciation with no salvage value was used through December 31, Year 8. On January 1, Year 9, it was estimated that the total useful life of the machine from acquisition date was ten years. Accordingly, the appropriate accounting change was made in Year 9. How much depreciation expense for this machine should Nathan record for the year ended December 31, Year 9? a. $4,200 b. $5,250 c. $7,000 d. $0