document.write( "Question 1111406: Mr. Jones has $10,000 to invest. He invests part at 6% and the rest at 8%. If he earns $680 in interest after 1 year, how much did he invest at each rate? \n" ); document.write( "

Algebra.Com's Answer #726406 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "Your equation is\r\n" );
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document.write( "0.06*x + 0.08*(10000-x) = 680,\r\n" );
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document.write( "where \"x\" is the amount of the 6% investment.\r\n" );
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document.write( "Solve for x:\r\n" );
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document.write( "0.06x + 800 - 0.08x = 680\r\n" );
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document.write( "-0.02x = 680 - 800 = -120  ====>  x =  = 6000.\r\n" );
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document.write( "Answer.  $6000 was invested at 6%.  The rest  $10000-$6000 = $4000 was invested at 8%.\r\n" );
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document.write( "Check.   0.06*6000 + 0.08*4000 = 680 dollars.   ! Correct !\r\n" );
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\n" ); document.write( "If you want more details or if you want to see other similar solved problems, 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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