document.write( "Question 1185194: A retired couple has $380,000 to invest. They chose one relatively safe investment
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Algebra.Com's Answer #815967 by ikleyn(52794) $\"\"$ $\"About$

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document.write( "Let  x  be the amount invested at  10%;\r\n" );
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document.write( "then the amount invested at  5%  is  (380000-x)  dollars.\r\n" );
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document.write( "Then the total interest equation to find x is\r\n" );
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document.write( "    0.1x + 0.05(380000-x) = 20000.\r\n" );
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document.write( "From the equation\r\n" );
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document.write( "    x =  = 20000.\r\n" );
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document.write( "ANSWER.  $20000 should be invested at 10%  and the rest amount,  (380000-20000) = 360000 should be invested at 5%.\r\n" );
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document.write( "CHECK.  0.1*20000 + 0.05*360000 = 20000  dollars, total annual interest.   ! Correct !\r\n" );
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\n" ); document.write( "\n" ); document.write( "It is a standard and typical problem on investments.\r
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\n" ); document.write( "\n" ); document.write( "If you need more details, or if you want to see other similar problems solved by different methods, look into the lesson \r
\n" ); document.write( "\n" ); document.write( " - Using systems of equations to solve problems on investment\r
\n" ); document.write( "\n" ); document.write( "in this site.\r
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\n" ); document.write( "\n" ); document.write( "You will find there different approaches (using one equation or a system of two equations in two unknowns), as well as
\n" ); document.write( "different methods of solution to the equations (Substitution, Elimination).\r
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\n" ); document.write( "\n" ); document.write( "Also, you have this free of charge online textbook in ALGEBRA-I in this site\r
\n" ); document.write( "\n" ); document.write( " - ALGEBRA-I - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lesson is the part of this online textbook under the topic \"Systems of two linear equations in two unknowns\".\r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Save the link to this online textbook together with its description\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Free of charge online textbook in ALGEBRA-I
\n" ); document.write( "https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson\r
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\n" ); document.write( "\n" ); document.write( "to your archive and use it when it is needed.\r
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