document.write( "Question 605163: Mr. Ang invested Php 16,000, a part of it at 9% and the rest at 4%, his total interest from at both investments was 900. how much he invest at each rate? \n" ); document.write( "
Algebra.Com's Answer #381593 by mananth(16946)\"\" \"About 
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Part I 9.00% per annum ---x
\n" ); document.write( "Part II 4.00% per annum ---y
\n" ); document.write( "Sum of investments
\n" ); document.write( "x + 1 y= 16000 -------------1
\n" ); document.write( "Interest earned on both investments
\n" ); document.write( "9.00% x + 4.00% y= 900
\n" ); document.write( "Multiply by 100
\n" ); document.write( "9 x + 4 y= 90000.00 --------2
\n" ); document.write( "Multiply (1) by -9
\n" ); document.write( "we get
\n" ); document.write( "-9 x -9 y= -144000.00
\n" ); document.write( "Add this to (2)
\n" ); document.write( "0 x -5 y= -54000
\n" ); document.write( "divide by -5
\n" ); document.write( " y = 10800
\n" ); document.write( "Part I 4.00% $ 10800
\n" ); document.write( "Part II 9.00% $ 5200
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\n" ); document.write( "CHECK
\n" ); document.write( "10800 --------- 4.00% ------- 432.00
\n" ); document.write( "5200 ------------- 9.00% ------- 468.00
\n" ); document.write( "Total -------------------- 900.00
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\n" ); document.write( "m.ananth@hotmail.ca
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