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    ryo23's Avatar
    ryo23 Posts: 20, Reputation: 3
    New Member
     
    #1

    Sep 15, 2009, 11:47 PM
    Percentage
    We need help with this problem. Let's go with the number 20 and if we add 5% the answer will be 21. OK But if we subtract 5% of 21 the answer is 19.55. Our question is how can we get back to the #20?

    It might be a simple answer but we need help. Is there a formula?

    VERY Confused!! :confused::confused::confused:
    ArcSine's Avatar
    ArcSine Posts: 969, Reputation: 106
    Senior Member
     
    #2

    Sep 16, 2009, 06:28 AM
    If u represents the percentage you originally added to the starting number (5%, in your example), then



    is the percentage you'd need to deduct from the intermediate amount to get back to your original starting number.

    For example, if you start by adding 25% to some starting number, then (by that formula) you'll get back to the starting number by deducting 20% from the intermediate amount.

    Of course, re-express your percentage into decimal form when using the formula; i.e. u = 0.05 in your example.

    Hope that helps out a bit.

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