You don't need to copy the serial number because it doesn't affect a bill's value.
1950A $20 notes are common among collectors and sell for face value or a couple of bucks more.
Face value only.
Depends on year and how low the serial number is.
one hundred cents. one dollar
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.
$10.00
$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.
Worth about 4 to 10 dollar depending on condition
The value of one dollar remains the same regardless of whether it is numbered in order or not; it is still worth one U.S. dollar. The serial number on a bill does not affect its currency value, though certain rare or collectible serial numbers can have added value to collectors. In everyday transactions, however, all one-dollar bills are equivalent in value.