document.write( "Question 431993: A mother wants to invest 12,000.00 for her son's future education. She invests a portion of the money in a bank certificate of deposite (CD accouts) which earns 4% and the remainder in a savings bond that earns 7%. if the total intrest earned after one year is $720.00 how much money was invested in the CD accounts.
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document.write( "The total intrest earned after one year is $720.00. How much money was invested in the CD account? \n" );
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Algebra.Com's Answer #299685 by jorel1380(3719)![]() ![]() You can put this solution on YOUR website! Let X equal the CD deposit,Y the savings bond deposit:\r \n" ); document.write( "\n" ); document.write( "X+Y=12,000 \n" ); document.write( ".04X+.07Y=720 \n" ); document.write( "Multiply the second equation by 100: \n" ); document.write( "4X+7Y=72000 \n" ); document.write( "4X+4Y=48000 \n" ); document.write( "Subtract the second from the first , we get: \n" ); document.write( "3Y=24000 \n" ); document.write( "Y=8000\r \n" ); document.write( "\n" ); document.write( "If Y=8000, then X=4000. \n" ); document.write( " |