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Math Help - Percents

  1. #1
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    Percents

    Please help me:

    Salary of Peter was increased for p percent and salery od John was decreased by q percent. After it thay have equal saleries.

    We known p, how to determined q (in function of p)?

    Peter sal. X
    John sal. Y

    X+pX=Y-qY
    ... ?
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  2. #2
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    Re: Percents

    As you see, q is not a function of p. In addition to p, you need to know X / Y.
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  3. #3
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    Re: Percents

    Quote Originally Posted by feferon11 View Post
    Please help me:

    Salary of Peter was increased for p percent and salery od John was decreased by q percent. After it thay have equal saleries.

    We known p, how to determined q (in function of p)?

    Peter sal. X
    John sal. Y

    X+pX=Y-qY
    ... ?
    qY= Y- X- pX

    q= (Y- X- pX)/Y

    gives q as a function of p, for fixed X and Y
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  4. #4
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    Re: Percents

    Since the increase and decrease are in percentage thus we should have
    X + p%X = Y - q%Y That gives
    X + pX/ 100 = Y - qY/100
    qY/100 = Y - X - pX/ 100
    Now proceed further
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