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Expert replies
by aninditasivaram2406 » Sun Nov 11, 2007 2:31 pm
A manufacturer produced x percent more cameras in 1994 than in 1993 and y percent more cameras in 1995 than in 1994. If he produced 1,000 cameras in 1993, how many cameras did the manufacturer produce in 1995?
·xy = 20
·x+y+xy/100 = 9.2

Answer is B
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Source: — Data Sufficiency |

by gmatguy16 » Mon Nov 12, 2007 6:46 pm
no in 93=1000
no in 94 =1000+10x ( x percent increase)

increase in 95 =(1000+10x)y/100 = 10y+0.1xy
no in 95=1000+10x+10y+0.1xy=1000+10(x+y)+0.1xy

now a is not sufficient
b says x+y+(xy)/100=9.2
means 10(x+y)+0.1xy=92
means 1000+10(x+y)+0.1xy=1092 so answer b.
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