127 DS A private fund make donation to some institution, Company X's donation to this institution equal to 10% of the private fund. The donation of X increase by 15% from 2007 to 2008. What is the difference of the total contribution between 2007 and 2008?
以下是引用shininglq在2009-4-18 19:35:00的发言: 我是这么做的,以2007,privatefund的donation为基数,as P 2007 2008 Private P P*(1+10%)(1+15%)/10% X P*(1+10%)--> P*(1+10%)(1+15%)
也就是说,知道上述4个值的任何一个,就可以了,所以D。
LS,我不太明白Company X's donation to this institution equal to 10% of the private fund这句话不是应该说X的donation数=10%P吗?