<PRE><B>Question 452177</B>
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You are adding the wrong things.


She borrowed 50 pesos from each friend and then gave back 1 peso to each of them for a total of 2 pesos that she has returned.  She now owes each of them 49 pesos each.  2 times 49 is 98 plus the 2 pesos she has already returned equals the 100 pesos she borrowed.


Note that the 98 pesos of her debt matches the 97 peso value of the dress plus the 1 peso she retained from the change.


Finally 100 pesos borrowed = 98 pesos still owed + 2 pesos returned = 97 peso dress + 1 peso she kept + 2 pesos returned.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
My calculator said it, I believe it, that settles it
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