document.write( "Question 85775: Lynn Ogen invested some money at 9% interest and $100 less than that at 7% interest. Her total annual interest was $73. How much did she invest at 7% interest? \n" ); document.write( "
Algebra.Com's Answer #61968 by ankor@dixie-net.com(22740)\"\" \"About 
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Lynn Ogen invested some money at 9% interest and $100 less than that at 7% interest. Her total annual interest was $73. How much did she invest at 7% interest?
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\n" ); document.write( "Let x = amt invested at 7%
\n" ); document.write( "Then
\n" ); document.write( "(x+100) = amt invested at 9%
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\n" ); document.write( "Problem basically states:
\n" ); document.write( "interest @ 9% + interest @ 7% = $73
\n" ); document.write( ":
\n" ); document.write( ".09(x+100) + .07x = 73
\n" ); document.write( ".09x + 9 + .07x = 73
\n" ); document.write( ".16x = 73 - 9
\n" ); document.write( "x = 64/.16
\n" ); document.write( "x = $400 invested at 7%
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\n" ); document.write( ":
\n" ); document.write( "Check:
\n" ); document.write( ".09(500) + .07(400) = $73 \n" ); document.write( "
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