Please check your bill again and post a new, separate question with its date and what letter if any is next to the date.
Serial numbers are counters and a security feature but rarely affect a bill's value or help to ID it. Some collectors will pay extra for numbers with a special pattern, e.g. 12345678, or low numbers such as 00000015.
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.
$20
$20
$10
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.
$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.