Not enough information. Is it a 50 euro bill, or a 50 mark bill? If it's 50 marks, what date is on it and what pictures are shown?
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Assuming you have a bill rather than coins, it's unlikely to be worth more than face value unless it's in brand-new condition. As of its last validity in 2002, that would be about US$25.
To explain, all DM-denominated coins and bills were removed from circulation in 2002 when Germany adopted the euro. It's still possible to redeem deutsche marks for euros but you have to be in Germany to do so.