SOLUTION: Equal amounts are invested at 6%, 7%, and 9% annual interest. If the three investments yield a total of $880 annual interest, find the total investment.
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Question 456875: Equal amounts are invested at 6%, 7%, and 9% annual interest. If the three investments yield a total of $880 annual interest, find the total investment. Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website! 6% ----x
7%-----x
9%-----y
880 interest
6x+7x+9x=880*100
22x=88000
x=88000/22
=4000
$ 4000 *3=$12,000
