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A store purchased a Brand C computer for the same amount that it paid for a Brand D computer and then sold them both at higher prices. The store’s gross profit on the Brand C computer was what percent greater than its gross profit on the Brand D computer?
题目解答
当前版本 由gmat美美更新于2014-01-15 20:12:11
Let the same amount of money spent on the computer C or Computer D is $x, and the price for computer C is c, Price for computer D is d. find [(c-x)- (d-x)] /(d-x)
Simplify what is being asked as: (c-d)/(d-x)
1) c=1.15d but information is given about x, so insufficient;
2) d-x=300 is given, but what about c-d? not sufficient
1)+2): (c-d)/(d-x)=0.15d/300, no information about d is given, so answer E.
以上不当之处， 欢迎指正！
PS: 我自己做题时选了 C 项， 因为当时有点儿着急赶时间， 所以疏忽了检查细节，想当然地认为（d-x）已经给出了， 没仔细看分子。 希望有可能跟我犯同样错误地G友们引以为戒！
Simplify what is being asked as: (c-d)/(d-x)
1) c=1.15d but information is given about x, so insufficient;
2) d-x=300 is given, but what about c-d? not sufficient
1)+2): (c-d)/(d-x)=0.15d/300, no information about d is given, so answer E.
以上不当之处， 欢迎指正！
PS: 我自己做题时选了 C 项， 因为当时有点儿着急赶时间， 所以疏忽了检查细节，想当然地认为（d-x）已经给出了， 没仔细看分子。 希望有可能跟我犯同样错误地G友们引以为戒！
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