document.write( "Question 274054: I need help in performing the correct steps to get to the answer. I have the solution, just don't think I arrived at it \"by the book\".\r
\n" ); document.write( "\n" ); document.write( "If $10,000 and $4000 are invested such that $1250 in interest is earned in 1 year, and the rate of interest on the larger investment is 2% more than that on the smaller investment, find the rates of interest.\r
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Algebra.Com's Answer #200076 by Theo(13342)\"\" \"About 
You can put this solution on YOUR website!
you invest 10000 and 4000 for 1 year and the interest earned is 1250.\r
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\n" ); document.write( "\n" ); document.write( "the rate of interest on the larger investment is 2% more than that earned on the smaller investment.\r
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\n" ); document.write( "\n" ); document.write( "2% divided by 100% = .02\r
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\n" ); document.write( "\n" ); document.write( "let x = the interest rate earned on the smaller investment.\r
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\n" ); document.write( "\n" ); document.write( "x + .02 = the interest rate earned on the larger investment.\r
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\n" ); document.write( "\n" ); document.write( "your equation is:\r
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\n" ); document.write( "\n" ); document.write( "(x+.02)*10000 + x*4000 = 1250\r
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\n" ); document.write( "\n" ); document.write( "you solve for x to get your answer.\r
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\n" ); document.write( "\n" ); document.write( "simplify your equation to get:
\n" ); document.write( "10000*x + .02*10000 + 4000*x = 1250
\n" ); document.write( "simplify further to get:
\n" ); document.write( "10000*x + 200 + 4000*x = 1250
\n" ); document.write( "combine like terms to get:
\n" ); document.write( "14000*x + 200 = 1250
\n" ); document.write( "subtract 200 from both sides of the equation to get:
\n" ); document.write( "14000*x = 1250 - 200
\n" ); document.write( "combine like terms to get:
\n" ); document.write( "14000*x = 1050
\n" ); document.write( "divide both sides of the equation by 14000 to get:
\n" ); document.write( "x = 1050/14000
\n" ); document.write( "simplify to get:
\n" ); document.write( "x = .075
\n" ); document.write( "that makes x+.02 equal to .095\r
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\n" ); document.write( "\n" ); document.write( "10000 * .095 + 4000 * .075 = 950 + 300 = 1250 confirming these values are correct.\r
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\n" ); document.write( "\n" ); document.write( "interest rate on the larger amount is .095 * 100% = 9.5%
\n" ); document.write( "interest rate on the smaller amount is .075 * 100% = 7.5%
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