Brief Exercise 9-6 a-b Pharoah Ltd. purchased a delivery truck on January 1, 2018, at a cost of $78,960. The truck is expected to have a residual value of $8,620 at the end of its 4-year useful life. Pharoah has a December 31 year end. Use the diminishing-balance method and assume the depreciation rate is equal to double the straight-line rate. Calculate the depreciation for each year of the truck's life. (Round answers to 0 decimal places, e.g. 5,275.) Depreciation expense 2018 2019 2020 2021 Calculate the depreciation in total over the truck's life. Total depreciation expense