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# When the price of a pen drive decreased by 10%, Pat is able

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Manager
Joined: 14 Dec 2004
Posts: 119
Followers: 1

Kudos [?]: 9 [0], given: 0

When the price of a pen drive decreased by 10%, Pat is able [#permalink]  05 Apr 2005, 20:19
When the price of a pen drive decreased by 10%, Pat is able to buy 2 more pen drives for \$360. What is the new price of 10 pen drives?

A. 20
B. 22
C. 200
D. 12
E. 180
SVP
Joined: 05 Apr 2005
Posts: 1733
Followers: 5

Kudos [?]: 37 [0], given: 0

Re: price [#permalink]  05 Apr 2005, 20:30
E. 180.
x=old price
n = number of pendrives can be purchased at x price

before; xn=360
after; x(n+2) = 400
solving the above equations, x=20 and n=18
so, new price = 10 (1-0.1) x= 10 (0.9) 20 = 180
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5079
Location: Singapore
Followers: 21

Kudos [?]: 180 [0], given: 0

Original = x
New = 0.9x

360/x + 2 = 360/0.9x
x = 20

New price = 18
10 pen drives = 180 (E)
Senior Manager
Joined: 19 Feb 2005
Posts: 488
Location: Milan Italy
Followers: 1

Kudos [?]: 10 [0], given: 0

first time I got a correct answer in a question of this nature!
E.180
x'*q'=x*q
q'=q+2
x'=0.9x
solve and get q
then it's easy
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