document.write( "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.
\n" ); document.write( " Please show all work, Thanks much \n" ); document.write( "

Algebra.Com's Answer #245805 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let each equal investment equal $\"x\"$ .
\n" ); document.write( " $\"%284%2F100%29x%2B%287%2F100%29x%2B%289%2F100%29x=720\"$
\n" ); document.write( " $\"4x%2B7x%2B9x=72000\"$
\n" ); document.write( " $\"20x=72000\"$
\n" ); document.write( " $\"highlight%28x=3600%29\"$
\n" ); document.write( "Each equals $\"x\"$ , the total would then be $\"highlight_green%283x=10800%29\"$ . \n" ); document.write( "

\n" );