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Thread: % is not math is devil

  1. #1
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    % is not math is devil

    Hi everyone,

    I really need help to understand how to operate % in basic math. here is my problem:

    a game in xbox store price $7 and 60% off how much the game would be without 60% off??

    I don't just need the answer but a proper way to solve this kind of problem.
    Thanks in Advance!!


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  2. #2
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    Re: % is not math is devil

    let the original price be $x$

    60% of $x$ is \$7

    so

    $\dfrac{60}{100}x = \$7$

    $0.6x=\$7$

    $x = \dfrac{\$7}{0.6} = \$11.\bar{6} \approx \$11.67$
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  3. #3
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    Re: % is not math is devil

    Let P_list = the list price (before the 60% discount). Let P_discount = the price after the 60% discount. The relationship between these two prices is:

     P_{discount} = P_{list} - 0.6P_{list}

    A little manipulation yields:

    P_{list} = \frac {P_{discount}} {1-0.6} = \frac {P_{discount}}{0.4}

    Now you can substitute $7 for P_discount, and calculate what the list price is.

    Quote Originally Posted by romsek
    let the original price be xx

    60% of xx is $7
    That would represent a discount of 40% off, but the OP said the discount was 60% off.
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  4. #4
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    % is not math is devil

    Hey guys can you please make it more readable, because I am lost. please less symbol. and focus on numbers. I am zero at math.


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  5. #5
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    Re: % is not math is devil

    (original price)[1 - (% off as a decimal)] = discounted price

    (original price) = (discounted price)/[1 - (% off as a decimal)]

    (original price) = \$7/[1 - (0.60)] = \$7/(0.40) = \$17.50
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  6. #6
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    Re: % is not math is devil

    x = original price

    Code:
                   x
    
    - .6x          7
    x - .6x = 7
    x(1 - .6) = 7
    .4x = 7
    x = 7 / .4
    x = 17.50

    Now go get your xBox
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    Re: % is not math is devil

    Thanks a lot @DenisB this is the one that I understood. thanks all of you it was nice to meet you and get help from you.


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  8. #8
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    Re: % is not math is devil

    Quote Originally Posted by madeny View Post
    Why You messing up with the Routine!!
    Reste tranquille, mon tabarnak!
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  9. #9
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    Re: % is not math is devil

    Quote Originally Posted by DenisB View Post
    Reste tranquille, mon tabarnak!
    I'm not your tabarnak


    Why You messing up with the Routine!!
    Last edited by topsquark; Oct 19th 2016 at 03:49 PM. Reason: Tweaked the language
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  10. #10
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    Re: % is not math is devil

    That was a joke...

    Anyway, what do you mean with "messing up with the Routine"?
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    Re: % is not math is devil

    Quote Originally Posted by DenisB View Post
    That was a joke...

    Anyway, what do you mean with "messing up with the Routine"?
    Sorry then!! I don't used to this kind of slang or vocabulary. " messing up with the Routine" is my signature. and it's from one of my favorites song from drake.


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  12. #12
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    Re: % is not math is devil

    Oh I see...why don't you put it in the "signature option": go to "settings".

    Then it'll appear automatically.
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  13. #13
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    Re: % is not math is devil

    Quote Originally Posted by DenisB View Post
    Oh I see...why don't you put it in the "signature option": go to "settings".

    Then it'll appear automatically.
    that's what I did!!


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  14. #14
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    Re: % is not math is devil

    Let the price of the game in xbox store before giving 60% off is $P.
    Price after 60% off = P - (60% of P)
    = P - (60P/100)
    = P - (3P/5) = 2P/5
    It is given that price after 60% off = $ 7
    So,
    2P/5 = $ 7
    P = (7 * 5)/2 = 35/2
    P = $ 17.5
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  15. #15
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    Re: % is not math is devil

    Quote Originally Posted by rahuljoshi View Post
    Let the price of the game in xbox store before giving 60% off is $P.
    Price after 60% off = P - (60% of P)
    = P - (60P/100)
    = P - (3P/5) = 2P/5
    It is given that price after 60% off = $ 7
    So,
    2P/5 = $ 7
    P = (7 * 5)/2 = 35/2
    P = $ 17.5
    It was just a typo error in the above post which is corrected. I hope it helps you.

    Let the price of the game in xbox store before giving 60% off is P.

    Price after 60% off = P - (60% of P) = = P - (60P/100) = P - (3P/5) = 2P/5

    It is given that price after 60% off = 7

    So,

    2P/5 = 7

    P = 17.5
    Last edited by rahuljoshi; Oct 24th 2016 at 03:01 AM.
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