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Math Help - Percentages and prices.

  1. #1
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    Percentages and prices.

    A watch was sold at a loss of 10%. If it was sold for $10 more, there would have been a gain of 10%. Find out how much the watch was for.

    Answer is 55
    Last edited by mr fantastic; October 10th 2011 at 11:17 AM. Reason: Re-titled.
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  2. #2
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    Re: Problem

    Quote Originally Posted by Numzilla View Post
    A watch was sold at a loss of 10%. If it was sold for $10 more, there would have been a gain of 10%. Find out how much the watch was for.

    Answer is 55
    Call S the selling price and C the cost price.

    Since it was sold at a loss of 10%, that means S = 0.9C (why?)

    If it was sold for $10 more, there would have been a gain of 10%. So S + 10 = 1.1C (why?)

    Solve these two equations simultaneously.
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