document.write( "Question 1121637: Equal amounts are invested at 2%, 7%, and 9% annual interest. If the three investments yield a total of $720 annual interest, find the total investment. \n" ); document.write( "

Algebra.Com's Answer #737616 by ikleyn(52798) $\"\"$ $\"About$

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document.write( "Let x be the unknown value of equal amounts invested at 2%, 7% and 9%.\r\n" );
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document.write( "Then your equation is\r\n" );
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document.write( "    0.02x + 0.07x + 0.09x = 720 dollars,   or\r\n" );
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document.write( "    0.18x = 720,\r\n" );
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document.write( "    x =  = 4000 dollars.\r\n" );
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document.write( "Answer.  The value of each of the three equal amounts is $4000.\r\n" );
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document.write( "Check.   0.02*4000 + 0.07*4000 + 0.09*4000 = 720 dollars.   ! Correct !\r\n" );
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