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Math Help - percentage: understand price reduction behaviour, previous price vs current price...

  1. #1
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    Aug 2011
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    percentage: understand price reduction behaviour, previous price vs current price...

    hi,
    i think that's a math problem rather than computer...

    have a current price and the previous price on a table
    my software calculates the perc reduction from the previous price
    and then i add a +x% to the final price...example +6% +20% tax
    but finally it doesn't match to the current price + 6% + 20% tax

    specific example:
    current price 1511.75
    previous price 1665.78
    so the exact percentage reduction is -9.24671925464347% that i'm rounding to -9

    well... if i add 6% and 20% to the previous price
    i get 1665.78*1.06*1.20= 2118.87*0.91= 1928.17
    my software does that
    but it doesn't match to current price 1511.75*1.06*1.20= 1922.94

    where is the mistake and how to avoid?
    thanks

    edit: ok, understood...if i want the exact value i can't round the percentage but it must be accurate otherwise when we have to do with prices they can swing too much...
    Last edited by johntort; August 12th 2011 at 05:27 PM.
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