document.write( "Question 1108100: Aaron invested equal amounts of money at 5%,7%,9%, and 11% annual interest. if the four investments yielded a total of $1440 annual interest, find the total amount invested. \n" ); document.write( "

Algebra.Com's Answer #723147 by ikleyn(52946) $\"\"$ $\"About$

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document.write( "0.05*x + 0.07*x + 0.09*x + 0.11*x = 1440   (where x is equal amount of each of the four investments).\r\n" );
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document.write( "0.32x = 1440  ====>  x =  = 4500.\r\n" );
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document.write( "4 (four) investments of $4500 each.  The total is 4 times $4500,  or  $18000.\r\n" );
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document.write( "Check.  (0.5 + 0.07 + 0.09 + 0.11)*4500 = 1440.   ! Correct !\r\n" );
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