A machine cost $500,000 on April 1, 2008. Its estimated salvage value is $50,000 and its expected life is eight years. Calculate the depreciation expense (to the nearest dollar) by each of the following methods, showing the figures used on a separate Excel spreadsheet as directed on the Problem Set 3 directions. a Straight-line for 2008 b Double-declining balance for 2009 c Sum-of-the-years'-digits for 2009