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Math Help - Percentage question #2.

  1. #1
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    Exclamation Percentage question #2.

    Shop A sells a dress for $280. This is 12% more than the price of a similar dress in shop B.

    (a) Find the price of the dress in Shop B.
    (b) During a sale, both shops offered an equal percentage discount on the
    dress. Doris bought the dress in Shop B and found that she paid
    $22.80 less than the discounted price in Shop A. What was the
    percentage discount?
    Last edited by mr fantastic; June 7th 2010 at 05:39 AM. Reason: Re-titled.
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  2. #2
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    Hi

    Let x be the price of the dress in shop B

    The price of the dress in shop A ($280) is 12% more than x

    280 = x \left(1 + \frac{12}{100}\right)

    From this equation you can get the value of x
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  3. #3
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    Quote Originally Posted by running-gag View Post
    Hi

    Let x be the price of the dress in shop B

    The price of the dress in shop A ($280) is 12% more than x

    280 = x \left(1 + \frac{12}{100}\right)

    From this equation you can get the value of x
    so what is the answer? i havent learnt this kind of equation yet , sorry):
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  4. #4
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    Quote Originally Posted by dtay View Post
    so what is the answer? i havent learnt this kind of equation yet , sorry):
    Are you saying you haven't learned how to add 1 + 12/100 and you haven't learned how to solve an equation like 280 = ax for x?

    You're expected to make some sort of effort after being given help.
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  5. #5
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    Quote Originally Posted by mr fantastic View Post
    Are you saying you haven't learned how to add 1 + 12/100 and you haven't learned how to solve an equation like 280 = ax for x?

    You're expected to make some sort of effort after being given help.
    I havent learned how to solve an equation like 280 = ax for x. Sorry . I am still in elementary 4.
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  6. #6
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    Quote Originally Posted by dtay View Post
    I havent learned how to solve an equation like 280 = ax for x. Sorry . I am still in elementary 4.
    Mathematics is an extremely sequential subject. Until you learn how to solve an equation like this (that is, a simple linear equation) you shouldn't be trying to solve a problem like the one you posted.
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  7. #7
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    For part B, I'll break it down to a point where I believe it's simple enough for you to solve by yourself.

    (280*(1-x))-(250*(1-x))=22.8
    280-280x-250+250x=22.8
    30-30x=22.8
    -30x=-7.2

    Can you take it from there?
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