Units-of-activity Depreciation A truck acquired at a cost of $350,000 has an estimated residual value of $21,700, has an estimated useful life of 49,000 miles, and was driven 3,900 mile during the year, Determine the following. If required, round your answer for the depredation rate to two decimal places. (a) The depreciable cost (b) The depreciation rate (C) The units-of-activity deprecation for the year 3 per mile