gwd07-35

由 **ai12345** » 2006-09-17 00:01

A clothing store acquared an item at a cost of x dollars and sold the item for y dollars. the store's gross profit from the item was what percent of its cost for the item?
A. Y-X=20
B.Y/X=5/4
答案是B 百思不解.請高手解答THANKS

由 **simonyu** » 2006-09-17 21:25

所求之答案為(y-x)/x

A. Y-X=20......沒有x的值，代入後為20/x，not sufficient

B.Y/X=5/4......從此可得出y=5x/4，代入所求之答案(5x/4-x)/x=1/4，sufficient

故答案B

由 **ai12345** » 2006-09-18 00:03

謝謝您 simonyu

gwd07-35

gwd07-35

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