document.write( "Question 1144256: Investments: 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 #765307 by ikleyn(52776) $\"\"$ $\"About$

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document.write( "Let \"x\" be the COMMON EQUAL value of each of the four investments.\r\n" );
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document.write( "Then the condition says that\r\n" );
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document.write( "    0.05x + 0.07x + 0.09x + 0.11x = 1440   dollars  (total annual interest).\r\n" );
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document.write( "Simplify and solve this equation\r\n" );
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document.write( "    0.32x                         = 1440\r\n" );
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document.write( "        x                         =  = 4500 dollars.\r\n" );
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document.write( "The total amount invested is 4x = 4*4500 = 18000 dollars.\r\n" );
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