A new machine costing $21,600 cash and estimated to have a $3,600 salvage value was purchased on January 1. The machine is expected to produce 2,000 units of product during its 10-year useful life. Calculate depreciation expense in the first year under the following independent situations. 1. The company uses the units-of-production method and the machine produces 300 units of product during its first year. 2. The company uses the double-declining-balance method. 3. The company uses the straight-line method.