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Math Help - Please help!!! I'm super confused!

  1. #1
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    Please help!!! I'm super confused!

    Ok, here's the deal. I had the following math problem:
    In 1997-41,344 motor vehicle production in countries outside the United States.
    In 1950-2,571 motor vehicle production in countries outside the United States.

    What was the percentage increase in motor vehicle production in countries outside
    the United States from 1950 to 1997?

    I took 41,344 and subtracted 2,571, this gave me a difference of 38,773.
    I then took the 38,773 and divided it by 2,571, this gave me 15.08.
    I then moved the decimal two places to the right which gave me a total of 1,508%.
    My teacher is telling me this is wrong. She said the answer is 15.08% because when you divide the two the answer is all ready in percent form.
    Is this right? I thought when you divided it was in decimal form and you had to convert it to a percent???????? Please help, All other probelms I have done this way were right but for some reason this one she says is wrong. Why would this all ready be in percent form if all other problems I do are not?
    Thank you for any help you have on this matter.
    Julie
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  2. #2
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    Quote Originally Posted by juliecooper View Post
    Ok, here's the deal. I had the following math problem:
    In 1997-41,344 motor vehicle production in countries outside the United States.
    In 1950-2,571 motor vehicle production in countries outside the United States.

    What was the percentage increase in motor vehicle production in countries outside
    the United States from 1950 to 1997?
    Subtract,
    38773
    Divide,
    38773/2571=15.08
    Now to get precents multiply by 100,
    1508%
    ---
    Your mistake was that you forgot to multily by 100.
    You took that number after division, what was just a decimal and had to be converted to percent.
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  3. #3
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    Quote Originally Posted by juliecooper View Post
    My teacher is telling me this is wrong. She said the answer is 15.08% because when you divide the two the answer is all ready in percent form.
    Is this right? I thought when you divided it was in decimal form and you had to convert it to a percent???????? Please help, All other probelms I have done this way were right but for some reason this one she says is wrong. Why would this all ready be in percent form if all other problems I do are not?
    Thank you for any help you have on this matter.
    Julie
    Your teacher is misguided

    Just check your work (which is correct) by finding 1508% of 2,571 and you'll prove you're correct. On the other hand, finding 15.08% of 2,571 will prove that she is wrong.
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    Thanks for the help!

    I had a feeling that I was right. I came up with 1508%. I have been back and forth with my teacher on this and she swears the answer is 15.08%. She said I am not supposed to multiply this by 100 because the answer 15.08 is all ready in percent form. I do my classes online, and it really bugs me that we have been going back and forth for 1 week now, and she is positive that the answer is 15.08%. What really gets me is this is a college teacher! Thanks for all of ya'lls help. I knew I was right, everyone I talked to said the same things. But my teacher just won't see it. I think I'm fighting a losing battle.
    Julie
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    Forum Admin topsquark's Avatar
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    Quote Originally Posted by juliecooper View Post
    I had a feeling that I was right. I came up with 1508%. I have been back and forth with my teacher on this and she swears the answer is 15.08%. She said I am not supposed to multiply this by 100 because the answer 15.08 is all ready in percent form. I do my classes online, and it really bugs me that we have been going back and forth for 1 week now, and she is positive that the answer is 15.08%. What really gets me is this is a college teacher! Thanks for all of ya'lls help. I knew I was right, everyone I talked to said the same things. But my teacher just won't see it. I think I'm fighting a losing battle.
    Julie
    You probably are fighting a losing battle. It's too bad that some people refuse to be corrected (by students in particular.) But take heart, it's only for a semester!

    -Dan
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  6. #6
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    Quote Originally Posted by juliecooper View Post
    I had a feeling that I was right. I came up with 1508%. I have been back and forth with my teacher on this and she swears the answer is 15.08%. She said I am not supposed to multiply this by 100 because the answer 15.08 is all ready in percent form. I do my classes online, and it really bugs me that we have been going back and forth for 1 week now, and she is positive that the answer is 15.08%. What really gets me is this is a college teacher! Thanks for all of ya'lls help. I knew I was right, everyone I talked to said the same things. But my teacher just won't see it. I think I'm fighting a losing battle.
    Julie
    As a teacher myself I can't stand teachers who won't be proved wrong.
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    Quote Originally Posted by juliecooper View Post
    I had a feeling that I was right. I came up with 1508%. I have been back and forth with my teacher on this and she swears the answer is 15.08%. She said I am not supposed to multiply this by 100 because the answer 15.08 is all ready in percent form. I do my classes online, and it really bugs me that we have been going back and forth for 1 week now, and she is positive that the answer is 15.08%. What really gets me is this is a college teacher! Thanks for all of ya'lls help. I knew I was right, everyone I talked to said the same things. But my teacher just won't see it. I think I'm fighting a losing battle.
    Julie
    You could refer you teacher to this site, and we will explain it to her.

    RonL
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    Or you can tell me who she is and I will kill her (painlessly of course).
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  9. #9
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    Quote Originally Posted by ThePerfectHacker View Post
    Or you can tell me who she is and I will kill her (painlessly of course).
    In case you are in doubt, ImPerfectHacker is joking.

    (He hasn't been allowed to kill people since the fall of the Soviet Union).

    RonL
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    Forum Admin topsquark's Avatar
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    Quote Originally Posted by CaptainBlack View Post
    In case you are in doubt, ImPerfectHacker is joking.

    (He hasn't been allowed to kill people since the fall of the Soviet Union).

    RonL
    (That we know of...)

    -Dan
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  11. #11
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    Quote Originally Posted by CaptainBlack View Post
    In case you are in doubt, ImPerfectHacker is joking.

    (He hasn't been allowed to kill people since the fall of the Soviet Union).

    RonL
    I kinda figured that. Besides I know plenty of Marines if I needed that done. LOL Just so you know I'm kidding. I would never ask them or anyone to do that as much as I would like to sometimes. Thanks for all your help. I'm calling my advisors and talking with them about it.
    Julie
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