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  1. #1
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    How 2 calculate subtotal amount ???

    Hey guys!

    I need help with this math:

    if I have Subtotal amount = 10
    Tax rate 8.5%
    then Grand Total = 10 + (10 * 8.5 / 100) = 10.85

    Now what if I have Grand total =10.85 and tax rate 8.5% - how to calculate the Subtotal ???

    Thanks
    Last edited by kevin28; May 1, 2009 at 19:09.

  2. #2
    Follow Me On Twitter: @djg gold trophysilver trophybronze trophy Dan Grossman's Avatar
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    Multiply your total by 1.0825.

  3. #3
    SitePoint Enthusiast
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    Quote Originally Posted by Dan Grossman View Post
    Multiply your total by 1.0825.
    are you sure this right? because 10.85 * 1.0825 = 11.745125 (not = 10) - how you got the number 1.0825 anyway?

  4. #4
    SitePoint Addict
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    Calculating the total including 8.5% tax can be done by multiplying the subtotal by 1.085:
    10.00 * 1.085 = 10.85

    Calculating the subtotal from the total including the 8.5% tax is done by apply the mathematical opposite (division):
    10.85 / 1.085 = 10.00

  5. #5
    SitePoint Enthusiast
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    thanks


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