A machine costs $60,000 today and has a useful life of 6 years when the salvage value is $4,000. Assume that 4 years from now, you can sell this machine into the market where its valuation is $38,000. Show the work for depreciation tables under the following depreciation methods: 1. straight-line method 2. double-declining method 3. first half double-declining \& second half straight-line Also decide if we should sell the machine at the end of year 4 or not for each of the three methods