document.write( "Question 549430: the amount of 8000 rupees is invested in bank , some at 6.5% and the rest at 4.5% How much should be invested in each in order to get an annual interest of rupees 420? \n" ); document.write( "

Algebra.Com's Answer #357745 by mananth(16946) $\"\"$ $\"About$

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Fund A 6.50% per annum ---x
\n" ); document.write( "Fund B 4.50% per annum ---y
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\n" ); document.write( "x + y= 8000 ------------------------1
\n" ); document.write( "6.50% x + 4.50% y= = 420.00
\n" ); document.write( "Multiply by 100
\n" ); document.write( "6.5 x + 4.5 y= = 42,000.00 --------2
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\n" ); document.write( "Multiply (1) by -6.5
\n" ); document.write( "we get
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\n" ); document.write( "-6.5 x -6.5 y= = -52000.00
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\n" ); document.write( "Add this to (2)
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\n" ); document.write( "0 x -2 y= = -10,000.00
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\n" ); document.write( "divide by -2
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\n" ); document.write( "y = 5,000.00 investment at 4.50%
\n" ); document.write( "Balance 3,000.00 investment at 6.50%
\n" ); document.write( "CHECK
\n" ); document.write( "$3,000.00 --------- 6.50% -------195.00
\n" ); document.write( "$5,000.00 ------- 4.50% ------- 225.00
\n" ); document.write( "Total -------------- 420.00
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