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by 1uponGMAT » Sun Sep 12, 2010 9:37 am
This is what I got:

(1) 2400 = 2x(20) 20 coats, twice as much = 2400 this is solvable for x, the gross profit

(2) 440 = 20(x+2) this is solvable for x

the answer is B, not D. Any help is appreciated, as always!

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Source: — Data Sufficiency |
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by Adi_Pat » Sun Sep 12, 2010 1:07 pm
Profit = 20 *(SP - CP)...so you need a value for (SP-CP)

Statement1 says that if SP = 2*SP , Profit =2400

2400 = 20 (2*SP - CP ) => 120 = 2SP - CP

from this I cannot solve for (SP - CP) = ?

Hence it is not sufficient.
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by 1uponGMAT » Sun Sep 12, 2010 3:22 pm
got it - the second one is solvable because the $2 goes into the selling price, thereby increasing the profit by $2. but (2) we do not know how much the sales prices is increasing. kind of wordy, but I can see how to solve it now.

Thanks!
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