Uh, a dime. If you're referring to purchasing power, it's a bit hard to say because so many things are so different today. A stamp cost 3¢, a newspaper was 2 or 3¢, a bus ride or a bottle of Coke...
The U.S. did not issue $100 bills with that date. Please check your bill again and post a new question. Thanks! There is a category specifically for coins and currency that makes it a lot easier to...
The exchange rate fixed when the DM was converted to the Euro would make 10DM wort $6.86. If you are asking how much a 10DM note would be worth to a collector, you would need to give an indication of...