Question 1204040
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Chris invested his savings in two investment funds. 
The $4000 that he invested in Fund A returned a 2% profit. 
The amount that he invested in Fund B returned a 7% profit. 
How much did he invest in Fund B, if both funds together returned a 5% profit?
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<pre>
Your equation is

    0.02*4000 + 0.07*B = 0.05*(4000+B)


To find B, simplify it step by step

    80 + 0.07B = 200 + 0.05B

    0.07B - 0.05 = 200 - 80

        0.02B    =    120

            B    =    120/0.02 = 6000.    <U>ANSWER</U>


<U>CHECK</U>.  Left side of equation (1) is  0.02*4000 + 0.07*6000 = 500.

        Right side is 0.05*(4000+6000) = 500, the same number.   ! correct !
</pre>

Solved.



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The solution by @josgarithmetic, giving the answer 2400 for amount B,
is incorrect, starting from his very first line to the very end.


No one line of his post is correct.



For the safety of your mind, you better ignore his post
as if you never seen it before.