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# GMAtPrep :DS

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GMAtPrep :DS [#permalink]  13 Aug 2006, 18:14
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E.

Let x be the price of the sofa last year.
Let n be the number of sofas sold last year.

Revenue = Number of sofa sold * price per sofa.

1) Not suff. We don't know the price of the sofa.
2) Not suff. We don't know how many sofas were sold.

Together
R1 = xn
R2 = (x+30)11n/10

Percent = R2-R1/R1 * 100
= (x+30)11n/10 - xn /xn
= xn/10 + 33n/ xn

Not suff.
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