document.write( "Question 669874: Mardi recieved an inheritance of $60000. She invested part at 7% and deposited the remainder in tax-free bonds at 11%. Her total annual income from the investments was $5400. Find the amount invested at 7%. \n" ); document.write( "
Algebra.Com's Answer #416600 by mananth(16946)\"\" \"About 
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Total invested 60,000
\n" ); document.write( "Interest----- 5400
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\n" ); document.write( "Part I 7.00% per annum ---x
\n" ); document.write( "Tax free bonds 11.00% per annum ---y
\n" ); document.write( "Total investment
\n" ); document.write( "x + y= 60000 -------------1
\n" ); document.write( "Interest on both investments
\n" ); document.write( "7.00% x + 11.00% y= 5400
\n" ); document.write( "Multiply by 2
\n" ); document.write( "7 x + 11 y= 540000.00 --------2
\n" ); document.write( "Multiply (1) by -7
\n" ); document.write( "we get
\n" ); document.write( "-7 x -7 y= -420000.00
\n" ); document.write( "Add this to (2)
\n" ); document.write( "0 x 4 y= 120000
\n" ); document.write( "divide by 4
\n" ); document.write( " y = 30000
\n" ); document.write( "Part I 7.00% $ 30000
\n" ); document.write( "Tax free bonds 11.00% $ 30000 \r
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\n" ); document.write( "CHECK
\n" ); document.write( "30000 --------- 7.00% ------- 2100.00
\n" ); document.write( "30000 ------------- 11.00% ------- 3300.00
\n" ); document.write( "Total -------------------- 5400.00
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\n" ); document.write( "m.ananth@hotmail.ca
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