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标题: 狗狗第153题提醒 [打印本页]

作者: fluxdark 时间: 2009-12-11 03:08
标题: 狗狗第153题提醒
查了一下其实就是金融里面的 rule of 72

For instance, if you were to invest $100 with compounding interest at a rate of 9% per annum, the rule of 72 gives 72/9 = 8 years required for the investment to be worth $200; an exact calculation gives 8.0432 years.

剩下的大家都会做了

作者: 苏27 时间: 2009-12-11 08:41
哇！这么神奇！感谢！就应该这么精益求精！

作者: zhaoyiqing 时间: 2009-12-11 09:03
啊我还是没看懂。。。

作者: zhaoyiqing 时间: 2009-12-11 09:07
那那道题就是72除8 加72除12吧

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