我怎么算不出来是12.5％ 请高人指教啊 谢谢作者: wolfheulen 时间: 2010-6-12 06:01
是这样，我不知道原题的措辞，但是我知道12.5%这个答案是怎么来的: if the 30% off price is based on original price, then the price is 70% of the original price now, since 20% off the original price is equivalent to 80% of the original price, the ratio of the 30%off price relative to the 20%off price is 70% / 80% = 87.5% and so the discount is 100% - 87.5% = 12.5%作者: wolfheulen 时间: 2010-6-12 06:06
另外一种解释就是先20%off，然后再把这个价钱30%off。但是如果把原价只减20%和上述答案相比，那么答案是显而易见的30%，等于要求你把原题rephrase一下。按照GMAC的出题思路，应该不会有这类题出现