SOLUTION: Equal amounts are invested at 2%, 7%, and 9% annual interest. If the three investments yield a total of $864 annual interest, find the total investment. $

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Question 897441: Equal amounts are invested at 2%, 7%, and 9% annual interest. If the three investments yield a total of $864 annual interest, find the total investment.
$
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
%282%2F100%29X%2B%287%2F100%29X%2B%289%2F100%29X=864
%2818%2F100%29X=864
X=%28864%2A100%29%2F18
X=4800
The total investment was three times that.
3X=14400