The One dollar coin is worth one Dollar
No, for silver coins as the value of silver changes the value of the coin changes. The same is true for gold coins.
Uh.... NO American coins say "100 cents" on them. And ALL American coins have the motto E Pluribus Unum on them. So please go back and look at what you have and post a new, separate question with enough details to ID the coin.
The FACE value is the same as all other US coins set by the denomination.
Just recently with the advent of bullion coins such as the American Silver Eagle. Coins intended for circulation were never 100% silver because silver is simply too soft of a metal for coinage. They were 90% silver in American coins until 1964 for dimes, quarters and half dollars, but other than bullion coins, no coins are made of 100% silver.
US 1974 $100 bills were only issued in one series so there were none printed with a letter after the date. Perhaps you're looking at the Federal Reserve District letter or a plate-position indicator. There's more information at the question "What is the value of a 1974 US 100 dollar bill?"
considered common, its value is about 5 cents
You need to have the coins evaluated in person. With only a brief description to go on it's not possible to assign a value - or even to know if the coins are genuine.
two different coins were made in 1871 : 1871A : 4.757.257 coins struck, value : about 60 dollars, 1871K : 1.215.072 coins struck, value : about 100 dollars.
100$
The silver coins would be more valuable - as the price of silver fluctuates. The value of the paper is irrelevant.
The coins are valued between $50 and $100. They coins are not common and the price can vary depending upon its condition.
20 = 100 / 5
You have 40 pennies, 8 nickels and 2 dimes. 40+40+20=100
The Spanish Milled Dollar isn't particularly rare, which affects its value. These coins range in value from $35 to $100.
These coins are worth between $100 (G) and $7000 (MS-64 Red).
No, for silver coins as the value of silver changes the value of the coin changes. The same is true for gold coins.
You don't. You don't EVER clean a gold coin and you don't clean a silver coin. Cleaning ruins the value of coins! If it has any collector value at all it will be demolished by a cleaning. Cleaning can take a $100 coin into a $10 coin. It will never, ever improve the value of the coin unless you literally dug it out of the ground. Do not clean coins.