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Calculating a percentage with the end percentage in mind

  1. #1
    Shadowshady
    Guest

    Calculating a percentage with the end percentage in mind

    I need to create a formula that will calculate percentage needed to reach a
    determined percentage at the end of the month.

    For example,
    week 1 = 14%
    Week 2 = 13.2%
    Week 3 = ?
    Week 4 = ?

    Month End Goal 13.8%

    Is there a way to calculate what percentage is needed for week 3 and 4 to
    acheive the goal?

    Thanks, Noah

  2. #2
    Valued Forum Contributor
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    It is best to do this type of thing using the original numbers, not the percentages. Work out the balance needed to make the total for the month then divide it by the number of weeks left, and calculate the % from there.

    Matt

  3. #3
    Bob Phillips
    Guest

    Re: Calculating a percentage with the end percentage in mind

    If you put in

    =3*13.8%-SUM(A1:A2)

    in the third cell, and

    =4*13.8%-SUM(A1:A3)

    in the fourth cell, that should doi it. At first the 4th cell will show
    13.8%, as the third will make all the correction, but when you overtype that
    with the achieved value, the fourth will adjust.

    --
    HTH

    Bob Phillips

    (replace somewhere in email address with gmail if mailing direct)

    "Shadowshady" <[email protected]> wrote in message
    news:[email protected]...
    > I need to create a formula that will calculate percentage needed to reach

    a
    > determined percentage at the end of the month.
    >
    > For example,
    > week 1 = 14%
    > Week 2 = 13.2%
    > Week 3 = ?
    > Week 4 = ?
    >
    > Month End Goal 13.8%
    >
    > Is there a way to calculate what percentage is needed for week 3 and 4 to
    > acheive the goal?
    >
    > Thanks, Noah




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