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Math Help - Some Specific Problems of Profit and Loss and Marked Price and Discount I

  1. #1
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    Some Specific Problems of Profit and Loss and Marked Price and Discount I

    Greetings all,

    This morning, I was solving some problems dealing with Profit, Loss, Marked Price and discount. The below 4 problems really confused me. I would appreciate if anyone here guide me........

    1. A man sells a bicycle at a gain of 10%. Had he bought it at 10%less, and sold it at $132 less, he would have still gained 10%. Find the cost price.

    2. A trader uses 920g instead of 1kg and sells the articles at the marked price which is 15% above the cost price. Find the % profit.

    Sincerely,
    Abhijit. G.
    Last edited by Ackbeet; May 14th 2011 at 02:52 AM. Reason: Splitting thread.
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  2. #2
    Member
    Joined
    Jan 2009
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    Punjab, Pakistan
    Posts
    88
    Here is how I tried P #1

    (R - C)/100 = 0.1

    ({R-132} - {C*0.90})/100 = 0.1

    (R - C)/100 = ({R-132} - {C*0.90})/100
    C*0.90 - C = R - 132 - R
    C*0.90 - C = - 132
    -0.1C = -132
    C = -132/-0.1
    C = 1320
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