BACK NE Exercise 9-19 Whippet Bus Lines uses the units-of-activity method in depreciating its buses. One bus was purchased on Januery 1, 2017, at a cost of $128,000 Over its 4-year useful life, the bus is expected to be driven 218,000 miles. Salvage value is expected to be $8,100. Your answer is incorrect. Try again. Compute the depreciation cost per unit. (Round answer to 3 decimal places, e.g. 6.251) Depreciation cost per unit Your answer is incorrect. Try again. Prepere a depreciation schedule assuming actual mileage wes: 2017, 51,200; 2018, 66,560; 2019, 52,480; and 2020, 34,560. (Round depreciation cost per unit to 3 decimal places, e.g. 0.125 and other answers to O declmal places, e.g. 125) End of Year Years Unitsof Activity Depreciation cost/uni-Annual Depreciation Expense Accumulated Depreciation Book Value 2017 2018 2019 8 9