求助prep数学题DS一道

Michelle_yu · 发表于 2010-5-23 12:28:01

Henry purchased 3 items during a sale. He received a 20% discount off the regular price of the most expensive item and a 10% discount off the regular price of each of the other 2 items. Was the total amount of the 3 discounts greater than 15% of the sum of the regular pricers of the 3 items?

(1)the regular price of the most expensive item was 50, the regular price of the second most expensive item was 20
(2)the regular price of the least expensive item was 15

答案是A

Patalizia · 发表于 2010-5-23 12:37:10

设三件物品的regular price 分别为p1,p2,p3(p1>p2>p3),
0.2p1+0.1(p2+p3)>0.15(p1+p2+p3),得出p1>p2+p3
(1)中，p1=50,p2=20,p3<p2,符合p1>p2+p3,所以选A

Michelle_yu · 发表于 2010-5-23 12:44:33

明白啦，谢谢

Patalizia · 发表于 2010-5-23 13:13:40

貌似现在讨论的人不是很多啊

Michelle_yu · 发表于 2010-5-23 13:31:53

可能大家都考完了吧，哎
你什么时候考呀

求助prep数学题DS一道

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