present value depreciation
... 现值率 present value rate 现值折旧 present value depreciation 线 长度单位nline ...
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约翰逊还提供了估算成本的成本明细表，实际上需要20年的维护成本，现值折旧率为5%。
Johnson also offers a cost breakdown of how that cost works. And yes, it's actually a 20-year cost, discounted back to present value using a 5% discount rate.
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