Wenner Furnace Corp. purchased machinery for $279,000 on May 1, 2012. It is estimated that it will have a useful life of 10 years, salvage value of $15,000, production of 240,000 units, and working hours of 25,000. During 2013, Wenner Corp. uses the machinery for 2,650 hours, and the machinery produces 25,500 units.
From the information given, compute the depreciation charge for 2013 under each of the following methods.
(c) Working hours