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31 AT 3 ) At the beginning of 2018 Gingrich Company purchased a machine for $510.090 ( salvage value of 351 090 ) that had a useful life of 12 years The bookkeeper used straight - line depreciation , but failed to deduct the salvage value In computing the depreciation base for the 3 years Prepare the journal entries in 2020 to correct the books , assuming that the books have not been closed . Disregard effects of corrections on income tax