SOLUTION: Equal amounts are invested at 4%, 7%, and 9% annual interest. If the three investments yield a total of $720 annual interest, find the total investment. Please show all work, Tha

Question 343472: Equal amounts are invested at 4%, 7%, and 9% annual interest. If the three investments yield a total of $720 annual interest, find the total investment.
Please show all work, Thanks much
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let each equal investment equal .

Each equals , the total would then be .
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