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FormosaMBA 傷心咖啡店 • 檢視主題 - pp-T1-DS114

pp-T1-DS114

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pp-T1-DS114

文章Huang Hsin-Yi » 2008-01-17 11:46

114.
Henry purchased 3 items during a sale. He received a 20 percent discount off the regular price of the most expensive item and a 10 percent discount off the regular price of each of the other 2 items. Was the total amount of the 3 discounts greater than 15 percent of the sum of the regular prices of the 3 items?

(1) The regular price of the most expensive item was $50, and the regular price of the next most expensive item was $20.

(2) The regular price of the least expensive item was $15.

Ans: A

好奇怪 在A選項 三個item只知兩個價格 要如何求出discount *-)
Huang Hsin-Yi
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文章: 1038
註冊時間: 2007-08-17 00:41
來自: Tainan

Re: pp-T1-DS114

文章puja » 2008-01-17 12:32

Huang Hsin-Yi \$m[1]:114.
Henry purchased 3 items during a sale. He received a 20 percent discount off the regular price of the most expensive item and a 10 percent discount off the regular price of each of the other 2 items. Was the total amount of the 3 discounts greater than 15 percent of the sum of the regular prices of the 3 items?

(1) The regular price of the most expensive item was $50, and the regular price of the next most expensive item was $20.

(2) The regular price of the least expensive item was $15.

Ans: A

好奇怪 在A選項 三個item只知兩個價格 要如何求出discount *-)


the regular price 應該是指一個標準的固定價格,也就是說有一個標準固定價格打20%折扣,然後打10%的折扣也有它一個標準價格~~
puja
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註冊時間: 2007-12-24 16:37

文章Huang Hsin-Yi » 2008-01-18 10:15

還是看不太懂PUJA大大的說明
能不能舉例說明 ;-$
Huang Hsin-Yi
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文章: 1038
註冊時間: 2007-08-17 00:41
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文章小花 » 2008-01-22 13:57

50*0.2=10------最高價的折扣
20*0.1=2-------次高價的折扣
設最低價賣X元
題目問總折扣是否大於15%
10+2+0.1X/50+20+X>15%
求得 30>X (X小於30時折扣會大於15%)

(1)告訴我們次低價20 最低價必小於30
條件充足
(2) 只有最低價的資訊 條件不足
小花
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文章Huang Hsin-Yi » 2008-01-22 16:30

喔 小花 你真是我的救命恩人 太感謝了!!
Huang Hsin-Yi
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文章: 1038
註冊時間: 2007-08-17 00:41
來自: Tainan

文章chencraig0227 » 2008-07-11 18:00

小花 \$m[1]:50*0.2=10------最高價的折扣
20*0.1=2-------次高價的折扣
設最低價賣X元
題目問總折扣是否大於15%
10+2+0.1X/50+20+X>15%
求得 30>X (X小於30時折扣會大於15%)

(1)告訴我們次低價20 最低價必小於30
條件充足
(2) 只有最低價的資訊 條件不足


....我算出來是X<150....不太一樣! 不過一樣是充分!
頭像
chencraig0227
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註冊時間: 2007-08-09 22:53

Re: pp-T1-DS114

文章sandrine » 2010-10-30 20:19

我覺得不是這樣算耶
我先設 3items 便宜A B C貴
題目是問總價錢個別三個items折扣是否有比全部一起折扣的多
列式是0.9A+0.9B+o.8C>(A+B+C)0.75???
條件一:
0.9A+18+40>0.75A+15+37.5
這樣看的話 前式一定大於後式 條件充足

條件二:
13.5+0.9B+o.8C>11.25+0.75B+o.85C
這樣因為B和C不確定 所以無法構成充分條件
答案才是A吧 (不知有沒有算錯...)
sandrine
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文章: 1
註冊時間: 2010-10-27 16:50


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