I need help with section (b). Can you also show me how you got the answers

Problem 9-2A (Part Level Submission) In recent years, Sheridan 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 shown as follows Salvage Value Useful Life in Years 4 4 4 Depreciation Bus Acquired Cost $ 95,600 120,000 83,640 Method 6,500 11,500 8,000 Straight-line Declining-balance Units-of-activity 2 For the declining-balance method, the company uses the double-declining rate. For the units-of-activity method, total miles are expected to be 122,000. Actual miles of use in the first 3 years were 2018, 24,000; 2019, 32,000; and 2020, 30,000 (a1) Your answer is correct For Bus #3, calculate depreciable cost per mile under units-of-activity method. (Round answer to 2 decimal places, e.g. 0.50.) Depreciable cost 0.62 per mile (a2) Your answer is correct. Compute the amount of accumulated depreciation on each bus at December 31, 2019. (Round depreciable cost per unit to 2 decimal places, e.g. 0.50 and depreciation rate to 0 decimal places, e.g. 15%. Round final answers to 0 decimal places, eg. 2,125.) Accumulated depreciation BUS 1 66825 BUS 2 105000 BUS 3 34720 Your answer is incorrect. Try again. If Bus 2 was purchased on April 1 instead of January 1, what is the depreciation expense for this bus in (1) 2017 and (2) 2018? (Round answers to O decimal places, e.g. 2,125.) 2017 2018 Depreciation expense 36000 33600