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Arithmetic percents

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Arithmetic percents

by selango » Thu May 27, 2010 3:41 am
Guy's net income equal his gross income minus his deductions.By what percent did guy's net income change on Jan 1,1989,when both his gross income and deductions increased?

1)Guy's gross income increased by 4 percent on January 1,1989

2)Guy's deductions increased by 15 percent on January 1,1989

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Source: — Data Sufficiency |
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by thephoenix » Thu May 27, 2010 4:13 am
net income z=x-y; x=gross income and y=deduction
s1) x2=1.04 x1 not suff
s2) y2=1.1.5 y1 not suff
s1+ s2===> z2=1.04x1-1.1.5y1, not suff to solve

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