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Math Help - Percentage Problem

  1. #1
    alanjo99
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    Percentage Problem

    Hi,

    I have a little problem - I want to sell an item for say 50 but offer a discount of 10% to regular customers

    I need a calculation to find out the advertised price then take 10% off to get the value back to 50

    If i add 10% to 50 = 55

    So if i advertise product at 55 then minus the 10% discount = 49.50 not the original 50 !

    Is there a simple calculation i can do on a calculator ?

    Many thanks in advance

    Alan
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  2. #2
    Bar0n janvdl's Avatar
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    Quote Originally Posted by alanjo99 View Post
    Hi,

    I have a little problem - I want to sell an item for say 50 but offer a discount of 10% to regular customers

    I need a calculation to find out the advertised price then take 10% off to get the value back to 50

    If i add 10% to 50 = 55

    So if i advertise product at 55 then minus the 10% discount = 49.50 not the original 50 !

    Id there a simple calculation i can do on a calculator ?

    Many thanks in advance

    Alan
    Remember that 50 Pounds = 100%

    Add 10%

    55 Pounds = 110%


    So use cross-multiplication to find the original price again.

    \frac{x}{55} = \frac{100}{110}
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  3. #3
    Member SengNee's Avatar
    Joined
    Jan 2008
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    Pangkor Island, Perak, Malaysia.
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    Quote Originally Posted by alanjo99 View Post
    Hi,

    I have a little problem - I want to sell an item for say 50 but offer a discount of 10% to regular customers

    I need a calculation to find out the advertised price then take 10% off to get the value back to 50

    If i add 10% to 50 = 55

    So if i advertise product at 55 then minus the 10% discount = 49.50 not the original 50 !

    Is there a simple calculation i can do on a calculator ?

    Many thanks in advance

    Alan




    I think that,

    50=90%
    x=100%

    Therefore,
     \frac {x}{50}= \frac {100}{90}
    x=55.56
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  4. #4
    Newbie
    Joined
    Sep 2007
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    Quote Originally Posted by alanjo99 View Post
    Hi,

    I have a little problem - I want to sell an item for say 50 but offer a discount of 10% to regular customers

    I need a calculation to find out the advertised price then take 10% off to get the value back to 50

    If i add 10% to 50 = 55

    So if i advertise product at 55 then minus the 10% discount = 49.50 not the original 50 !

    Is there a simple calculation i can do on a calculator ?

    Many thanks in advance

    Alan

    Let price to be sold be X

    After 10% discount, you want the price to be 50

    X - 10% of X = 50

    X - 0.1 X = 50

    0.9X = 50

    X = 50/0.9

    X = 55.56


    Double check your calculation..

    If the advertised price is 55.56, after 10% discount, it becomes 55.56 - 10%(55.56) = 55.56 - 0.1 * 55.56 = 50.004 (~50)

    Hope this helps.
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