每8年翻倍是根據年回報率9%算的，用理財的4%提取方法，平均每年會多出5%繼續投資，根本不用動本金。

來源: hhtt 於 2024-02-04 17:47:46 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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