狗狗第153题 提醒

fluxdark

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

苏27

哇！这么神奇！感谢！就应该这么精益求精！

zhaoyiqing

啊 我还是没看懂。。。

zhaoyiqing

那那道题就是72除8 加72除12吧