In recent years, Pina 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 below. For the declining-balance method, the company uses the double-declining rate. For the units-of-activity method, total miles are expected to be 118,000 . Actual miles of use in the first 3 years were: 2019,27,000;2020,35.500; and 2021,31,000. Calculate depreciable cost per mile for Bus 3. (Round answer to 2 decimal places, e.g. 0.50.) Compute the amount of accumulated depreciation on each bus at December 31,2020. If Bus no. 2 was purchased on April 1 instead of January 1, what is the depreciation expense for this bus in 2018 and 2019 ? (Round answers to 0 decimal places, e.g. 2,125.)