BE9.4 (LO 2) Buckingham Ltd. purchased a delivery truck on January 1, 2021, at a cost of $80,000. The truck is expected to have a residual value of $8,000 at the end of its four-year useful life. Buckingham has a December 31 year end. Calculate the depreciation using the straight-line method (a) for each year of the truck's life, and (b) in total over the truck's life. Calculate partial-year straight-line depreciation. non. BE9,7 (LO 2) Depreciation information for Buckingham Ltd. is given in BE9.4. Assuming the delivery truck was purchased on May 1 instead of January 1, calculate the depreciation expense using the diminishing-balance method for 2021 and 2022. Assume the depreciation rate is equal to one times the straight-line rate. Calculate units-of-production depreciation. RROSO