Cullumber Ltd. purchased a delivery truck on January 1, 2021, at a cost of $87,040. The truck is expected to have a residual value of $8,620 at the end of its 4-year useful life. Cullumber has a December 31 year end. Calculate the depreciation using the straight-line method for each year of the truck's life. Depreciation for each year $ Calculate the depreciation using the straight-line method in total over the truck's life. Total depreciation expense