Kleener Co. acquired a new delivery truck at the beginning of it's current fiscal year. The truck cost $31,000 and has an estimated useful life of four years and an estimated salvage value of $4,100. a1. Calculate depreciation expense for each year of the truck's life using Straight-line depreciation. a-2 Calculate depreciation expense for each year of the truck's life using Double-declining-balance depreciation. b. Calculate the truck's net book value at the end of it's third year under each depreciation method