If you specifically mean a 1912 penny, the value depends on condition and the mint mark. A 1912 with no mint mark is worth at least a dollar and upwards of about $25. The 1912-D goes for at least $5 and as much as $140. Then a '12-S is worth no less than $10 and goes up to $130. Again, the value depends on condition.
A penny is 1/100 or .01.
$100
100
about $100
about $100
depends on year,mint,and condition. could be 50cents or a couple of million! Most 100 year old pennies are about 15 cents and you can expect to get 5 cents from a coin dealer.
100 million
4 pouns was worth $100 today
A US "penny" is actually a 1 cent coin, worth 1/100 of a dollar. A British penny (the coin's official name) is worth 1/100 of a pound sterling.
1 cent, 1/100 of a dollor
It really depends on what book it is and the author. Something well-known is likely to sell for more than something unknown.
100