Calculate depreciation. A machine cost $500,000 on April 1, 2008. Its estimated salvage value is $50,000 and its expected life is eight years. Instructions Calculate the depreciation expense (to the nearest dollar) by each of the following methods, showing the figures used. (a) Straight-line for 2008 (b) Double-declining balance for 2009 (c) Sum-of-the-years'-digits for 2009