January 5, 2014, for $116,600. The equipment was expected to have a useful life of three years, or 20,000 operating hours, and a residual value of $6,600. The equipment was used for 8,700 hours during 2014, 7,380 hours in 2015, and 3,920 hours in 2016. Required: 1. Determine the amount of depreciation expense for the years ended December 31, 2014, 2015, and 2016 by (a) the straight-line method, (b) the units-of-output method, and (c) the double-declining-balance method