document.write( "Question 1111648: A certain amount of money is invested at 6% per year. A second amount is Php5000 larger than the first is invested at 8% per year. The interest from the investment at the higher rate exceeds the income from the lower investment by Php500. Find the investment at each rate. \n" ); document.write( "
Algebra.Com's Answer #726638 by Theo(13342) You can put this solution on YOUR website! x equals the amount invested at 6%. \n" ); document.write( "x + 1000 equals the amount invested at 8%.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "the interest on the amount invested at 8% is 500 more than the interest on the amount invested at 6%.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "the equation for that is:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( ".08 * (x + 1000) = .06 * x + 500\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "simplify to get .08 * x + 80 = .06 * x + 500\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "subtract .06 * x from both sides of this equation and subtract 80 from both sides of this equation to get:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( ".02 * x = 420\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "divide both sides of this equation by .02 to get:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "x = 420 / .02 = 21,000\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "go back to your original equation and replace x with 21,000.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "the original equation is .08 * (x + 1000) = .06 * x + 500\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "replace x with 21,000 to get:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( ".08 * 22,000) = .06 * 21,000 + 500\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "simplify to get:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "1,760 = 1,760, which is true.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( ".08 * 22,000 = 1,760 \n" ); document.write( ".06 * 21,000 = 1,260\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "the difference is 500, as stated in the problem statement.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "the solution is:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "21,000 was invested at 6% and 22,000 was invested at 8%.\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |