3. DuPont Company purchases a machine at a cost of $18,000 on January 01, 2008. This machine has a lifetime of 4 years which is equivalent to 160,000 hours and a salvage value of $2,000 Actual annual usages are Year Actual Usage in hours 2008 40,000 2009 60,000 2010 35,000 2011 25,000 Required: Calculate the Depreciation expense for each year by using the following methods. #) Double Declining Balance Method b) Units-Of-Activity Method (4)