This site has a category specifically for coins and currency that makes it a lot easier to find questions about, well, coins and currency.
Also, as you have seen in other postings, a bill's serial number almost never affects its value. What matters is the date, series letter, and condition. See the link below,
Depends on year and how low the serial number is.
The percentage of a partial bill really has little to do with its value. Any bill is worth its face value if it contains a complete serial number and any part of the other serial number.
$10
$20
The serial number alone isn't enough to assign value, but rather the series year and the condition. Without more information, it's assumed to be worth one dollar.
Face value.
The value is more dependent on the year (series) of the bill. The serial number by itself isn't enough information.
As you have seen in many other postings, a bill's serial number almost never has anything to do with its value.
$20
$5
The value is determined by the series (date) and condition.
The serial number isn't really useful in giving a value. Post a new question and include information like the series (date) and condition.