In order to answer this question, you would have to be more specific on which bill you are talking about.
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Despite its age, a 1969 $100 bill isn't considered to be rare. As of 11/2010, values are around $105 for a circulated bill and $140 for an uncirculated one, regardless of the series letter.
Abraham LINCOLN, not just "Abraham", and he's ON the bill, not "in" it because he is considered to be one of America's greatest presidents for having led the country during the Civil War and preserving the Union.
Sailors have to avoid rocks otherwise the ship may founder. Bill Gates is considered the founder of Microsoft
Despite its age this is not considered to be a rare bill in circulated condition. As of 04/2012 values range from face to $140 depending on condition. A nice uncirculated one can bring $175-$200.
If it's a genuine $50 bill that someone has pasted a different picture onto, it's considered altered or damaged and is only worth face value. In that case it would have to be redeemed at a bank in exchange for an undamaged bill. If it's smaller than a regular bill it's a replica and isn't worth much more than the paper it's printed on.