Solve and explain for all 3 buses.

In recent years, Avery Transportation purchased three used buses. Because of frequent turnover in the accounting department, a different accountant selected the depreciation method for each bus, and various methods were selected. Information concerning the buses is summarized as follows. For the declining-balance method, the company uses the double-declining rate. For the units-of-activity method, total miles are expected to be 116,200. Actual miles of use in the first 3 years were: 2014, 27,900; 2015, 31,600; and 2016, 30,800. Compute the amount of accumulated depreciation on each bus at December 31, 2015. (Round answers to 0 decimal places, e.g. 2,125.) 2015