gmat pre question

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gmat pre question

by pradeepkaushal9518 » Fri May 07, 2010 12:22 pm
Guy's net income equals his gross income minus his deductions. By what percent did Guy's net income change on January 1, 1989, when both his gross income and his 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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by scoobydooby » Fri May 07, 2010 12:32 pm
1) and 2) are not sufficient by themselves.

together,
% change in N= G(1.04-1)- D(1.15-1)/(G-D)
=> (0.04G-0.15D)/(G-D) cannot be solved
not sufficient

hence, E

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by debmalya_dutta » Fri May 07, 2010 1:02 pm
cannot be determined => hence option E