Bonde Company purchased a machine on January 1, year 1, for $3,000,000. At the date of acquisition, the machine had an estimated useful life of 6 years with no salvage.  The machine is being depreciated on a straight-line basis. On January 1, year 4, Bonde determined, as a result of additional information, that the machine had an estimated useful life of 8 years from the date of acquisition with no salvage. An accounting change was made in year 4 to reflect this additional information. What is the amount of depreciation expense on this machine that should be charged in Bonde’s income statement for the year ended December 31, year 4?
　　A. $500,000
　　B. $300,000
　　C. $375,000
　　D. $100,000
　　Answer：B
　　B is corrent. Per ASC 250-10-45-17, changes in accounting estimates are reflected prospectively (i.e., no retroactive adjustment). As computed below, the depreciation base beginning in year 4 is $1,500,000.  The depreciation taken in year 1-year 3 was $1,500,000 ($3,000,000/6 years × 3 years). The remaining depreciation base of $1,500,000 ($3,000,000 – $1,500,000) is divided by 5 years (8 years – 3 years since acquisition), resulting in $300,000 per year depreciation.