document.write( "Question 1163730: Equal amounts are invested at 5%,7%, and 9% annual interest. If the three investments yield a total of $840 annual interest , find the total investment. \n" ); document.write( "

Algebra.Com's Answer #787918 by ikleyn(52787) $\"\"$ $\"About$

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document.write( "0.05x + 0.07x + 0.09x = 840   dollars  (total interest equation).\r\n" );
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document.write( "0.21x = 840\r\n" );
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document.write( "x =  = 4000 dollars invested to each account, in all  12000 dollars.    ANSWER\r\n" );
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