Aussie Imports purchased a specialized piece of machinery for $50,000 on January 1, 20X3. At the time of acquisition, the machine was estimated to have a service life of 5 years (25,000 operating hours) and a residual value of $5,000. During the 5 years of operations (20X3 - 20X7), the machine was used for 5,100, 4,800, 3,200, 6,000, and 5,900 hours, respectively. Instructions Compute depreciation for 20X3 - 20X7 by using the following methods: straight line, units of output, and double-declining-balance.