《最新GMAT数学机考模拟150题》陈向东__037 请指教谢谢

qiqiusa

    

Candy hearts were marked down from 30% to 50% on Valentine’s Day. The
following day, candy hearts were marked down an additional 25%. What was the
lowest cost of a candy heart that originally sold for $28?

    

A.$7        B.$12.60        C.$14       D.$15.40        E.$21

正确答案是:A


     小弟题目看不大明白，请大哥大姐帮我翻译一下告诉我怎么做的，谢谢了啊……

cloudymind

原来$28元，Valentine's day marked down to 50%, 第二天又 marked down an additional 25%，总共 marked down 50%+25%=75%

现在= 28*(1-75%)=7

那个30%是混淆视听的 

sembx

我很疑惑... 在美国这边,商品打50%off+ extra 25%off, 如果原价是$28的话, 商家通常的做法是 28* (1-0.5) *(1-0.25)= 10.5.

我手头有几张圣诞节购物的收据, 都是这样计算的. 比如说商家在圣诞节期间(12.24~ 1.1)所有货品30%off, 在12.26当天可以"take an additionl 20% off", 我在12.26当天买东西的收据显示的计算方式都是: " 原价* 0.7* 0.8 "!

这是怎么回事呢? 是不是"mark down an additional ...%" 与" take an addtional ....%"两个不同的概念啊?

[此贴子已经被作者于2008-1-5 3:00:22编辑过]

qiqiusa

是啊，我和二楼的楼主一样，都是很疑惑……

qiqiusa

还有我不明白这句“Candy hearts were marked down from 30% to 50% on Valentine’s Day. ”应该怎么翻译？？？

szy733

第一天的折扣是30～50%，但是第二天又增加了25%的折扣，变成了55%～75%，所以在这个打折范围之内能够盈利或者不愧的成本应该是28 * (1-75%) = 7。选择A。

[此贴子已经被作者于2009-2-26 13:19:32编辑过]