document.write( "Question 725861: You are deciding how to invest a total of $20,000 in two funds paying 5.5% or 7.5% simple interest. You want to earn a total of $1300 in interest from the investments each year. How much should you invest at 5.5% and how much should you invest at 7.5% to earn $1300?
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Algebra.Com's Answer #444367 by mananth(16946)\"\" \"About 
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Part I 5.50% per annum ---x *
\n" ); document.write( "Part II 7.50% per annum ---y
\n" ); document.write( "Total investment
\n" ); document.write( "x + 1 y= 20000 -------------1
\n" ); document.write( "Interest on both investments
\n" ); document.write( "5.50% x + 7.50% y= 1300
\n" ); document.write( "Multiply by 100
\n" ); document.write( "5.5 x + 7.5 y= 130000.00 --------2
\n" ); document.write( "Multiply (1) by -5.5
\n" ); document.write( "we get
\n" ); document.write( "-5.5 x -5.5 y= -110000.00
\n" ); document.write( "Add this to (2)
\n" ); document.write( "0 x 2 y= 20000
\n" ); document.write( "divide by 2
\n" ); document.write( " y = 10000 - x)
\n" ); document.write( "Part I 5.50% $ 10000
\n" ); document.write( "Part II 7.50% $ 10000
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\n" ); document.write( "CHECK
\n" ); document.write( "10000 --------- 5.50% ------- 550.00
\n" ); document.write( "10000 ------------- 7.50% ------- 750.00
\n" ); document.write( "Total -------------------- 1300.00
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\n" ); document.write( "m.ananth@hotmail.ca
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