<a href='http://news.yahoo.com/blogs/ticket/romney-release-2011-tax-return-paid-irs-14-181125301--election.html' target='_blank' rel='nofollow'>http://news.yahoo.com/blogs/ticket/romney-release-2011-tax-return-paid-irs-14-181125301--election.html</a><br/><br/>"The Romneys paid $1,935,708 in taxes on $13,696,951 of mostly investment income <b><i><span style="color:#ff0000;">for</span> </i></b>an effective tax rate of 14.1 percent."<br/><br/>I cannot find the definition from this <a href='http://www.learnersdictionary.com/search/for' target='_blank' rel='nofollow'>dictionary </a>that fits the sentence. Could it be that <b><i>"for"</i></b> is used incorrectly?