Whippet Bus Lines uses the units-of-activity method in depreciating its buses. One bus was purchased on January 1, 2017, at a cost of $146,000. Over its 4-year useful life, the bus is expected to be driven 246.250 miles. Salvage value is expected to be $8,100. (a) Compute the depreciation cost per unit. (Round answer to 3 decimal ploces, es. 6.251) Depreciation cost per unit eTextbook and Media Attempts: 0 of 3 used