plz help

Victor Mineli, the new controller of Sunland Company, has reviewed the expected useful lives and salvage values of selected depreciable assets at the beginning of 2017. Here are his findings: All assets are depreciated by the straight-line method. Sunland Company uses a calendar year in preparing annual financial statements. After discussion, management has agreed to accept Victor's proposed changes. (The "Proposed" useful life is total life, n remaining life.)