SOLUTION: Equal amounts are invested at 3%, 7%, and 9% annual interest. If the three investments yield a total of $684 annual interest, find the total investment.

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Equal amounts are invested at 3%, 7%, and 9% annual interest. If the three investments yield a total of $684 annual interest, find the total investment.      Log On


   

Question 896619: Equal amounts are invested at 3%, 7%, and 9% annual interest. If the three investments yield a total of $684 annual interest, find the total investment.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+.03x+%2B+.07x+%2B+.09x+=+684+
+.19x+=+684+
+3600+
The total investment was
+3%2A3600+=+10800+
$10,800