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Math Help - Taking Percentage Away

  1. #1
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    Taking Percentage Away

    Hi There,

    I am arguing with my boss over how to minus a percentage.

    If you want to work out the VAT on 100 you divide by 1.2 and then minus the 100 which is 16.67 VAT

    If i then want to pay someone 12% of that 100 my boss says u times by 0.12 which gives you 12 where as i think you divide by 1.12 and then minus the 100 which gives you 10.72

    Can somebody please tell me which way is the right one


    Many Thanks

    Stuart
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  2. #2
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    e^(i*pi)'s Avatar
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    Quote Originally Posted by stuart1988 View Post
    Hi There,

    I am arguing with my boss over how to minus a percentage.

    If you want to work out the VAT on 100 you divide by 1.2 and then minus the 100 which is 16.67 VAT
    Your method is correct

    If i then want to pay someone 12% of that 100 my boss says u times by 0.12 which gives you 12 where as i think you divide by 1.12 and then minus the 100 which gives you 10.72
    Your boss is correct
    Last edited by e^(i*pi); June 3rd 2011 at 07:43 AM. Reason: quoting for clarity
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  3. #3
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    ok this is where i do not understand vat is taking off 20% of a figure u divide so why multiply when taking 12%? its just a different percentage
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  4. #4
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    e^(i*pi)'s Avatar
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    Quote Originally Posted by stuart1988 View Post
    how can we both be correct when there are 2 different figures?
    I'm quite confused by the OP, it looks like there are two different questions there. Your way of working out that VAT on the given amount (100 inc VAT) is correct.

    What does 12% have to do with VAT?
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  5. #5
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    well what i am saying is you divide vat so why multiply something that is exactly the same its just a different percentage! VAT you want 20% of the amount and i want 12% of the amount so why not divide by 1.12 rather than 1.2
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  6. #6
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    e^(i*pi)'s Avatar
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    You multiply for the 12% because you want to find 12% of 100. If your 100 was including the 12% then you would indeed divide by 1.12

    You divide for VAT because the 100 figure already includes VAT. If your 100 was before the addition of VAT then you'd multiply
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