Instructions Compute the depreciation expense under the following methods and complete the depreciation schedules below. (a) Straight-line depreciation. (b) Activity method, assuming that machine usage was 15,000 hours for 2014; 14,000 hours for 2015; 13,000 hours for 2016 and 8,000 hours for 2017. (c) Sum-of-the-years'-digits. (d) Double-declining-balance. Straight-line Year 1 2 3 4 st Book Value, Cost Beginning Depreciation Expense Accumulated Depreciation = depr exp. Book Value, Ending =Cost - A/D Units of Productio