The coin you're referring to is the 50 Pfennig piece. The obverse has the number 50 printed in the centre and the words Bundesrepublik Deutschland - Pfennig around the outside. The J immediately underneath the 50 indicates where the coin was minted, in this case Hamburg.
The following letters denoted the various German mints:
A - Berlin
D - Munich
F - Stuttgart
G - Karlsruhe
J - Hamburg
About 25 Euro Cent
Unless it's uncirculated, about 30¢ (face value)
1¢. At the time it was replaced by the euro (2002) the Deutschmark was worth about 50¢ U.S.
It is worth nothing. The Germans no long use the mark, but are on the Euro. When it was used a 50 pfennig was about 5 cents. One pfennig was a penny.
if you mean how much larger the USA is than the Bundesrepublik Deutschland, Germany has an area of 357.021 km2 while the USA is 9.83 million km2. That makes Germany 3.6 % the size of the 50 states and various territories of the USA.
You are asking about a 50 Pfennig (KM#109.2) coin from Germany. The coin is weighs 3.5 grams, measures 20mm in diameter, and is made of copper-nickel. The front has a large "50" in the middle, with "PFENNIG" below and "BUNDESREPUBLIK DEUTSCHLAND" (German for "Federal Republic of Germany") above. The back has an image of a woman planting an oak seedling with the date below. An aggregate of about 140 million such coins were produced for circulation at four different mints (signified by the mintmarks D, F, G or J beneath the "50"), and another 180,000 in Proof. According to the Standard Catalog of World Coins, about US$0.50 in Uncirculated condition and US$0.75 in Proof, regardless of the mintmark.
The 50 pf denomination was moderately common in Germany until 2002 when the euro was adopted. sammler.com, a major German collectibles site, lists a value of about US$2.75 for an uncirculated coin. In circulated condition it's only worth face value, about 25¢ when Germany switched to the euro.
Zero. At best it was worth sixty cents. All this currency was worthless after the Euro was introduced.
More details are needed - specifically, what denomination? "Bundesrepublik Deutschland" means "Federal Republic of Germany", so your question is similar to saying "What is a 1975 United States worth?". In any case, most German coins from that period are only worth face value or a bit more. At the time Germany switched to the euro in 2002 the mark was worth about 50 cents and the pfennig was worth about 1/2 cent, so that may help to pin down your coin's value.
There has been 50 states since 1959, so there were 50 in 1972.
This coin was part of the old Deutschmark and pfennig system that was used prior to the introduction of the euro in 2002. At the time the exchange rate was roughly 1 DM = 50¢ U.S. There were 100 pfennige* to the mark, so your coin is, I'm sorry to say, only worth one-half of a U.S. cent. (*) "Pfennige" is the plural of "pfennig". The word is the source of our "penny".
About $3.50 if worn, around $30.00 in Very Fine condition. Coins marked Bank Deutscher Länder (Bank of the German States) were issued in 1948-49 prior to the reunification of West Germany. When the BRD (Bundesrepublik Deutschland) was formed in 1950 the same designs were used but the inscription was changed to reflect the unified country's name.