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Mathematical accuracy in xpath

From: kinobo@-----------.---------.---
To: NULL
Date: 6/16/2009 5:30:00 AM
If I execute the following xslt I get the result given below.
I'm no mathematician but 100 times 2500.01 does not equal 250001.00000000003
I can find very little about this on the web and no suggested fixes or 
solutions.
This is causing me a big problem as my entire architecture hangs around xslt.
Using VS2008 and have IE8 installed.
Can anyone help? Please?

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform" >
  <xsl:template match="/">
    <res>
      <xsl:value-of select="2500.01 * 100"/>
    </res>
  </xsl:template>
</xsl:stylesheet>


<?xml version="1.0" encoding="utf-8"?>
<res>250001.00000000003</res>


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