Depreciation methods on january 2, 2018, skyler, inc. purchased a laser cutting machine to be used in the fabrication of a part for one of its key products. the machine cost $120,000, and its estimated useful life was four years or 920,000 cuttings, after which it could be sold for $5,000. required a. calculate each year's depreciation expense for the machine's useful life under each of the following depreciation methods (round all answers to the nearest dollar): 1. straight-line. 2. double-declining balance. 3. units-of-production. (assume annual production in cuttings of 200,000; 350,000; 260,000; and 110,000.) b. assume that the machine was purchased on july 1, 2018. calculate each year's depreciation expense for the machine's useful life under each of the following depreciation methods: 1. straight-line. 2. double-declining balance.