What Else Could I Buy instead of a mathematics lesson book?

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<CENTER><TABLE CELLSPACING=0 STYLE="border:solid black 2px; margin:30px; background:#0088bb; font-family:Verdana,sans-serif;"><TR><TD STYLE="font-weight:bold; background:#0077aa; padding:3px; color:black;">If you were <A STYLE="color:black;" HREF="http://quiz.ravenblack.net/prices.pl?t=a+mathematics+lesson+book&p=20&c=USD">intending to buy a mathematics lesson book</A> for US$20.00, you could instead buy:</TD></TR><TR><TD><UL STYLE="text-align:left; color:black;"><LI>one eighteenth of a low-end camcorder</LI><LI>two haircuts</LI><LI>one thousand, six hundred and fifty-two cups-worth of cheap own-brand instant coffee granules</LI><LI>twenty-one minutes of massage</LI><LI>one eight-hundredth of an elephant</LI><LI>one third of a cast-iron wok</LI><LI>five hand buzzers</LI><LI>eleven pints of horrible beer at some sort of happy-hour thing</LI><LI>five hundred grams of cheese</LI><LI>a kung-fu lesson</LI></UL></TD></TR></TABLE><TABLE CELLSPACING=0 STYLE="border:solid black 1px; background:#cccccc; color:black; font-family:Verdana,sans-serif;"><TR><TD STYLE="background:#aaaaaa; font-weight:bold; color:black;">What are you thinking of buying?</TD></TR><TR><TD STYLE="color:black;"><FORM ACTION="http://quiz.ravenblack.net/prices.pl" METHOD="GET">I might buy <INPUT TYPE="TEXT" NAME="t" /> for <INPUT TYPE="TEXT" NAME="p" SIZE=4 /> <SELECT NAME="c"><OPTION VALUE="EUR">Euros</OPTION><OPTION SELECTED VALUE="USD">US dollars</OPTION><OPTION VALUE="CAD">Canadian dollars</OPTION><OPTION VALUE="GBP">UK pounds sterling</OPTION><OPTION VALUE="AUD">Australian dollars</OPTION></SELECT><INPUT TYPE="SUBMIT" VALUE="Go" /></FORM></TD></TR></TABLE></CENTER>