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 1123247: 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 ikleyn(52787) About Me  (Show Source):
You can put this solution on YOUR website!
.
0.06x + 0.07x + 0.09x = 880.


Solve for x.


Then evaluate 3x.