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The price per share of stock X increased by 10 percent over

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Manager
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Joined: 30 Aug 2007
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The price per share of stock X increased by 10 percent over [#permalink] New post 30 Sep 2007, 07:43
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The price per share of stock X increased by 10 percent over the same time period that the price per share of stock Y decreased by 10 percent. The reduced price per share of stock Y was what percent of the original price per share of stock X?

(1) The increased price per share of stock X was equal to the original price per share of stock Y.

(2) The increase in the price per share of stock X was 10/11 the decrease in the price per share of stock Y.


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Director
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Re: DS 111 from OG 11th Ed. [#permalink] New post 30 Sep 2007, 07:56
avenger wrote:
The price per share of stock X increased by 10 percent over the same time period that the price per share of stock Y decreased by 10 percent. The reduced price per share of stock Y was what percent of the original price per share of stock X?

(1) The increased price per share of stock X was equal to the original price per share of stock Y.

(2) The increase in the price per share of stock X was 10/11 the decrease in the price per share of stock Y.


from 1: we know that => 1.1x = y
0.9y/x = 0.9(1.1x)/x = 0.99

from 2: we know that => 0.1x = 10/11 (0.1y)
1.1x = y

so again, suff...

D.
VP
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Re: DS 111 from OG 11th Ed. [#permalink] New post 30 Sep 2007, 10:19
Fistail wrote:
avenger wrote:
The price per share of stock X increased by 10 percent over the same time period that the price per share of stock Y decreased by 10 percent. The reduced price per share of stock Y was what percent of the original price per share of stock X?

(1) The increased price per share of stock X was equal to the original price per share of stock Y.

(2) The increase in the price per share of stock X was 10/11 the decrease in the price per share of stock Y.


from 1: we know that => 1.1x = y
0.9y/x = 0.9(1.1x)/x = 0.99

from 2: we know that => 0.1x = 10/11 (0.1y)
1.1x = y

so again, suff...

D.


Fistail, r u trading shares at Goldman Sachs? :)
Director
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Joined: 03 May 2007
Posts: 899
Schools: University of Chicago, Wharton School
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Re: DS 111 from OG 11th Ed. [#permalink] New post 30 Sep 2007, 11:16
Ravshonbek wrote:
Fistail wrote:
avenger wrote:
The price per share of stock X increased by 10 percent over the same time period that the price per share of stock Y decreased by 10 percent. The reduced price per share of stock Y was what percent of the original price per share of stock X?

(1) The increased price per share of stock X was equal to the original price per share of stock Y.

(2) The increase in the price per share of stock X was 10/11 the decrease in the price per share of stock Y.


from 1: we know that => 1.1x = y
0.9y/x = 0.9(1.1x)/x = 0.99

from 2: we know that => 0.1x = 10/11 (0.1y)
1.1x = y

so again, suff...

D.


Fistail, r u trading shares at Goldman Sachs? :)


Thats what I want to do. I want to handle Prep desk at Goldman Sacs.
Re: DS 111 from OG 11th Ed.   [#permalink] 30 Sep 2007, 11:16
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