Question - Cullumber Company purchased machinery for $176,400 on January 1, 2017. It is estimated that the machinery will have a useful life of 20 years, salvage value of $14,700, production of 88,600 units, and working hours of 38,100. During 2017, the company uses the machinery for 13,716 hours, and the machinery produces 18,606 units. Compute depreciation under the straight-line, units-of-output, working hours, sum-of-the-years'-digits, and double-declining-balance methods.