--- /dev/null
+<?xml version="1.0"?>
+<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
+ <xsl:template match="/">
+ <xsl:copy-of select="site/open_auctions/open_auction[sum(bidder/increase) > 10 * initial]/interval"/>
+ </xsl:template>
+</xsl:stylesheet>
\ No newline at end of file