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more x percent & y percent

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more x percent & y percent

by Xbond » Thu Aug 20, 2009 1:00 am
Hi there,

If I well understood this DS, IMO is E but I'm not sure for 100%. Could explain to me the concept of this ?

A manufacturer produced x percent more video cameras in 1994 than in 1993 and y percent more video cameras in 1995 than in 1994. If the manufacturer produced 1,000 video cameras in 1993, how many video cameras did the manufacturer produce in 1995 ?

(1) xy = 20
(2) x + y + xy/100 = 9.2
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Source: — Data Sufficiency |
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by tohellandback » Thu Aug 20, 2009 1:44 am
IMO B
In 1993: 1000
In 1994: 1000+ 10X
In 1995: 1000+ 10X + Y/100 *(1000+10X)
= 1000 +10X+10Y+ XY/10
=1000 +10* (X+Y+ XY/100)

1) we need the value of X+Y
NOT SUFF

2) substitute the value given

SUFF
The powers of two are bloody impolite!!
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