Rank formula and duplicates

I need a rank formula that will rank in descending order.
Formula needs to take into consideration duplicates and assigne a unique ranking number fo each duplicates.

Thanks

Zbor,

Your example is not working for me its sorting numbers rather than asssigning the rankings.

Originally Posted by martindwilson

SEE HERE
http://www.cpearson.com/excel/Rank.aspx

I tried this but none of this worked.