SOLUTION: A woman has $5,000 invested at 8% annual interest. At what rate must she invest an additional $10,000 so that her annual income from both investments is 9% of her total investment?

Question 937247: A woman has $5,000 invested at 8% annual interest. At what rate must she invest an additional $10,000 so that her annual income from both investments is 9% of her total investment?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = rate at which 10000 is invested
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5000*0.08 + 10000x = 15000*0.09
10000x = 15000*0.09 - 5000*0.08
x = (15000*0.09 - 5000*0.08)/10000
x = 0.095
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answer:
invest the additional %10,000 at 9.5%
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