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Depreciation by units-of-activity method A diesel-powered tractor with a cost of $281,440 and an estimated residual value of $5,500 is expected to have a useful operating life of 73,000 hours. During April, the tractor was operated 300 hours. Determine the depreciation for the month. If required, carry out any division to two decimal places. Depreciation by two methods A storage tank acquired at the beginning of the fiscal year at a cost of $129,600 has an estimated residual value of $8,000 and an estimated useful life of 5 years. a. Determine the amount of annual depreciation by the straight-line method. b. Determine the amount of depreciation for the first and second years computed by the double-declining-balance method. Do not round the double-declining balance rate. If required, round your answers to the nearest dollar