A truck acquired at a cost of $170,000 has an estimated residual value of $11,900, has an estimated useful life of 51,000 miles, and was driven 5,100 miles during the year. Determine the following. If required, round your answer for the depreciation rate to two decimal places. what is The depreciable cost ? what is The depreciation rate per mile? what is The units-of-activity depreciation for the year?