(6 points) Semtech Company purchased a machine on January 1, 2014, by paying cash of $300,000. The machine has an estimated useful life of six years, is expected to produce 400,000 units, and has an estimated residual value of $40,000. 6. A. Calculate depreciation expense to the nearest whole dollar for each year of the machine's useful life under 1. Straight-line depreciation method. 2. Double declining-balance method. B. What is the book value of the machine after three years using the double declining-balance method? C. What is the book value of the machinery after three years using the straight-line method? D. If the machine was used to produce and sell 120,000 units in 2014, what would be the depreciation expense using the units-of-production method