Question 997721
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Ms.Vangie Dimaano wishes to realize a return of 12% on her total investments. 
If she has P40,000 invested at 10%, then how much additional money should she invest at 14%?
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        Calculations in the post by @lwsshak3 are fatally incorrect and lead to wrong answer.

        For correct solution see what follows in my post.



let x=additional money invested at 14%
0.1*40000 + 0.14x = 0.12*(40000+x)
4000 + 0.14x = 4800 + 0.12x
0.02x = 800
x = 800/0.02 = 80000/2 = 40000.


how much additional money should she invest at 14% ? P40,000.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>ANSWER</U>


Solved correctly to teach you in a right way.



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Since 12% is midway between 10% and 14%, this answer is intuitively obvious 
without any calculations, so the problem can be easily solved/answered MENTALLY.