GWD的一道数学。。请教

fish55 · 发表于 2010-3-21 11:41:27

Q6:
Sue’s monthly earnings consist of a monthly salary and a 4 percent commission on the portion of her monthly sales that is in excess of $2,000. If Sue’s monthly salary was the same in July as in August, how much greater were her sales in July than in August?
(1) Sue’s monthly earnings were $3,620 in July and $3,580 in August.
(2) Sue’s monthly salary was $3,500 in July and in August.
answer:a
请大牛们看看~~~

fish55 · 发表于 2010-3-21 11:56:39

这题争议好像蛮多。。。是不是条件不足。。。急！！！！！！！！

烧饼的梦 · 发表于 2010-3-21 12:59:04

不知道这样解对不对。。。
设7月的monthly sales为x，8月的monthly sales 为y
monthly salary+4%(x-2000)=3620
monthly salary+4%(y-2000)=3580
二式相减得4%（x-y）=40
所以x-y=1000
所以选a

fish55 · 发表于 2010-3-21 21:12:21

嗯。。。这样解释还是可以。。谢谢！

烧饼的梦 · 发表于 2010-3-22 18:48:27

客气客气，互相帮助嘛，你有空了帮我看一下这几道吧？呵呵~http://forum.chasedream.com/GMAT_Math/thread-446853-1-2.html，贴上去没人理我。。。。

GWD的一道数学。。请教

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