Concord Company purchased equipment for $228,400 on October 1, 2020. It is estimated that the equipment will have a useful life of 8 years and a salvage value of $12,400. Estimated production is 40,000 units and estimated working hours are 20,000. During 2020, Concord uses the equipment for 500 hours and the equipment produces 1,000 units. Compute depreciation expense under each of the following methods. Concord is on a calendar-year basis ending December 31. (Round rate per hour and rate per unit to 2 decimal places, e.g. 5.35 and final answers to 0 decimal places, e.g. 45,892.) (a) $ Straight-line method for 2020 6750 (b) Activity method (units of output) for 2020 5400 (c) $ Activity method (working hours) for 2020 5400 (d) $ Sum-of-the-years-digits method for 2022 36000 (e) Double-declining-balance method for 2021 $ 4500