Government bonds - the most simple example
Using an example from the US treasury's website you can buy a \$100 dollar face value bond that pays 3% annual interest semiannually for thirty years. That means you would get $100 \cdot 3\% / 2 = 1.5$ dollars every six months, and at the end of the thirty years you also get \$100. In total you would get $1.5 \cdot 2 \cdot 30 + 100 = 190$ dollars but as it is explained in the link in Jamzy's comment adding up dollars in this case is not very sensible, because dollars in different years have different value.  (If you disagree I would love to trade with you. For 1000 dollars today I will happily give you 1000 dollars 10 years from now.)
 The price you pay for this bond is determined by auction. Using this you can calculate the yield of the bond. (Again, please see the explanation in the link.)
 The answer would follow the same logic for €100,000. You can convert the euros to dollars or find a suitable European bond.