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Math Help - Setting up and solving equations involving percentages

  1. #16
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    Quote Originally Posted by illeatyourxface View Post
    wait what am i multiplying? 12,400 or 9,600??

    im confused again
    that's for checking your answers. you found x, so going back to your basic equations, just plug the values of x for the equations and you'll find the profit.
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  2. #17
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    Quote Originally Posted by yeongil View Post
    No, you already found the amount of each investment, $9,600 and $12,400. When you were asking about multiplying by 0.07 & 0.02, I thought you were checking your work.

    Multiplying $9,600 by 0.07 gives the profit made from the first investment, which is $672.
    Multiplying $12,400 by 0.02 gives the profit made from the second investment, which is $248.
    Adding the two profits together gives us the $920 that we needed.
    Please reread my posts carefully, particularly post #11 (which I quote above). Thanks.


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  3. #18
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    ohhh okay i see! sorry about that, im a little fustrated, i have another similar problem...here

    a man invested a total of $3,000 in 2 investments. he made a profit of 3% on the first investment and 4% on the second investment. if his total profit was $107, what was the amount of each investment?


    soooo im gonna try and set it up...

    1st investment: .03x
    2nd investment: .04( 3,000 -x) ???
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  4. #19
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    Quote Originally Posted by illeatyourxface View Post
    ohhh okay i see! sorry about that, im a little fustrated, i have another similar problem...here

    a man invested a total of $3,000 in 2 investments. he made a profit of 3% on the first investment and 4% on the second investment. if his total profit was $107, what was the amount of each investment?


    soooo im gonna try and set it up...

    1st investment: .03x
    2nd investment: .04( 3,000 -x) ???
    correct!
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  5. #20
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    and then the equation is


    .03x + .04(3,000- x) =107


    and x = 1,300


    and then 3,000- 1,300 = investment 2 = 1,700?
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  6. #21
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    Quote Originally Posted by illeatyourxface View Post
    and then the equation is


    .03x + .04(3,000- x) =107


    and x = 1,300


    and then 3,000- 1,300 = investment 2 = 1,700?
    Correct! you have mastered this!
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  7. #22
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    thank you so much!
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  8. #23
    Super Member malaygoel's Avatar
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    Quote Originally Posted by illeatyourxface View Post
    ohh wait i think i get it! the $9600 is the profit and thats why you subtract it from $22000.

    and then we get $12,400 and the we find each investment by multiplying it by .07 and .02?

    is that correct?
    $9600 is the first investment

    profit from first investment=.07*$9600=$672

    Similarly, find for the other investment


    EDIT: I forgot to refresh the window....so this was posted
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