Problem 9-2A (Part Level Submission) In recent years, Marigold 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 Bus Cost 1 4 Acquired 1/1/17 1/1/17 1/1/18 $ 99,400 124,000 89,140 2 Depreciation Method Straight-line Declining-balance Units-of-activity $ 7,000 10,500 8,500 4 3 4 For the declining-balance method, the company uses the double-declining rate. For the units-of-activity method, total miles are expected to be 126,000. Actual miles of use in the first 3 years were 2018, 23,500; 2019, 36,000; and 2020, 32,500. (a1) 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 per mile $