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Simple percentage question

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    Hi, so i'm about to embarrass myself here.

    I have 2 questions on an exam.

    1) X has increased 1% to 2,537. What was the value of X originally?

    2) X has decreased by 9% to 1,586. What was the value of X originally?

    I did question 1) as follows (so you can see my working):

    X + 0.01X = 2537
    1.01X = 2537
    X= 2537 / 1.01 = 2511.88

    2511.88 has increased 1% to 2537.

    How do I do a decrease calculation?? Obviously if I follow the same logic I get a lower number, I need a higher one...
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    (Original post by aewart)
    Hi, so i'm about to embarrass myself here.

    I have 2 questions on an exam.

    1) X has increased 1% to 2,537. What was the value of X originally?

    2) X has decreased by 9% to 1,586. What was the value of X originally?

    I did question 1) as follows (so you can see my working):

    X + 0.01X = 2537
    1.01X = 2537
    X= 2537 / 1.01 = 2511.88

    2511.88 has increased 1% to 2537.

    How do I do a decrease calculation?? Obviously if I follow the same logic I get a lower number, I need a higher one...
    1 is correct
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    (Original post by aewart)
    Hi, so i'm about to embarrass myself here.

    I have 2 questions on an exam.

    1) X has increased 1% to 2,537. What was the value of X originally?

    2) X has decreased by 9% to 1,586. What was the value of X originally?

    I did question 1) as follows (so you can see my working):

    X + 0.01X = 2537
    1.01X = 2537
    X= 2537 / 1.01 = 2511.88

    2511.88 has increased 1% to 2537.

    How do I do a decrease calculation?? Obviously if I follow the same logic I get a lower number, I need a higher one...
    You do follow the same logic

    x - 0.09x =1586

    is your starting point
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    (Original post by TenOfThem)
    You do follow the same logic

    x - 0.09x =1586

    is your starting point
    Boom, done! Thanks!

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Updated: July 4, 2012
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