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请教一道逻辑题,国外论坛的解释和官方答案不太一样...........

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楼主
发表于 2010-3-26 21:47:34 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
Last August the XT chain of gasoline stations had a temporary sales promotion in effect. In the promotion, any customer who made a purchase of ten or more gallons of gasoline was entitled to a free car wash. For the month of August, XT experienced a ten percent increase in gasoline sales as compared to sales in August the previous year, so evidently the promotion was successful as a means of boosting sales.

In evaluating the argument, it would be most helpful to answer which of the following?
A.    In the areas in which XT’s gasoline stations operate, how did total combined gasoline sales for all gasoline stations last August compare with sales for the previous August?
B.    Was the money that XT earned from the increase in gasoline sales enough to offset the cost of providing free car washes during the promotion?
C.    Were there any customers who bought ten or more gallons at an XT gasoline station during the promotion who would have or more gallons at an XT gasoline in lower quantities, but more frequently, if the promotion had not been in effect?
D.    Did XT or any of its gasoline stations have to pay other businesses to provide the car washes that customers were offered in the promotion?
E.    Are XT’s gasoline sales in August usually significantly higher than one twelfth of XT’s annual gasoline sales?


国外论坛也是众说纷纭,答案是A,但是个人认为c更有道理。
无论是不是每个加油站都增长了sale,sale涨了就说明措施有效。
而C的说法则说明需求总量没有增长,只是把未来的潜在需求提前消费了。

不知道是不是自己的思路进入偏角了,希望有大牛可以帮忙解答一下,谢谢........................
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沙发
发表于 2010-3-27 01:00:36 | 只看该作者
C确实可以说没有增长,因为只是将以前购买数量少但次数多的顾客来刺激一次购买大数量的汽油。
所以8月sales不增长。汽油是一种几天就得加一次的商品,顾客需求的透支不会太远,因此如果真的是按透支需求的假设来说,sales是几乎保持稳定的。而不像楼上说的那样sales增长了。

而A选项确定后就能排除影响汽油销售量的其他因素了。

楼主多多指教。
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