Question 1132941
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Let x be the amount invested in company A' stock, in dollars.

Then the amount invested in company B' stock is  (100000-x) dollars.


Your basic equation is 


    13% gain - 3% loss         = 8% return,    or


    0.13x    - 0.03*(100000-x) = 0.08*100000.


Simplify step by step and solve for x:


    0.13x - 3000 + 0.03x = 8000,

    0.16x = 8000 + 3000

    0.16x = 11000  ====>  x = {{{11000/0.16}}} = 68750.


<U>ANSWER</U>.  68750 dollars invested in company A' stock;  the rest,  100000 - 68750 = 31250 dollars invested in company B' stock.


<U>CHECK</U>.   0.13*68750 - 0.03*31250 = 8000 dollars.    ! Correct !
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Solved.