CASE FOUR CQ Company purchases a factory machine at a cost of $18,000 on October 1, 2012. CQ expects the machine to have a salvage value of $2,000 at the end of its 4-year useful life. During its useful life, the machine is expected to be used 160,000 hours. Actual annual hourly use was: 2012, 40,000; 2013, 60,000; 2014, 35,000; and 2015, 25,000 Requirements: Prepare depreciation schedules for the following methods: (a) straight-line, (b) units of-activity, and (c) declining-balance method