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At a certain bookstore, the regular price of each book is 20

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Intern
Intern
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Joined: 05 Nov 2008
Posts: 6
At a certain bookstore, the regular price of each book is 20 [#permalink]

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New post 05 Nov 2008, 20:34
At a certain bookstore, the regular price of each book is 20 percent less than its list price. If during a sale the price of each book at the store was 15 percent less than its regular price, then the price of a book during the sale was what percent less than its list price?

A. 30%
B. 32%
C. 35%
D. 38%
E. 40%

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Intern
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Joined: 04 Nov 2008
Posts: 15
Re: book --30 [#permalink]

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New post 06 Nov 2008, 06:02
let R = regular price
L = List price
S = Sale price

from the question

R = 0.8*L ----------- equation# 1
S = 0.85*R ----------equation# 2

substitute 1 in 2

==>

S= 0.85*(0.8*L)

S=0.68*L

that means Sale price is 68% of the list price

means that Sale price is less than list price by 100% - 68% = 32%


the answer is B

Good luck
Director
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Joined: 14 Aug 2007
Posts: 697
Re: book --30 [#permalink]

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New post 06 Nov 2008, 06:16
caiyun wrote:
At a certain bookstore, the regular price of each book is 20 percent less than its list price. If during a sale the price of each book at the store was 15 percent less than its regular price, then the price of a book during the sale was what percent less than its list price?

A. 30%
B. 32%
C. 35%
D. 38%
E. 40%


if L is list price and s is "sale price"
sale price = 80/100 * L - 15/100 * 80/100 * L = 0.80L - 0.12L = 0.68L

32% less
B

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: book --30   [#permalink] 06 Nov 2008, 06:16
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At a certain bookstore, the regular price of each book is 20

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