Please post a new question. The date and denomination are needed. Serial numbers are counters and a security feature but rarely affect a bill's value, and don't help to identify its denomination.
waiting for an answer
when was the g series launched
There were no $2 bills dated 1929. However, letters for the 1928 series go up to G so if that's what you have, please see the question "What is the value of a 1928 G US 2 dollar bill?"
No US $20 bill carries a "G" series letter. You may be looking at the Federal Reserve District letter. The series letter, if any, on US bills is next to the date. Regardless, a date is needed in order to estimate a value. Please determine the bill's date and see the question "What is the value of a [date] US 20 dollar bill?" for more information.
The highest series letter for that year was C rather than G. The series letter if any will be located next to the date. Please see the Related Question for more information.
The motto "In God We Trust" also appeared on 1935-series $1 bills with an "H" series letter as well as "G". Please see the question "What is the value of a 1935 H US 1 dollar silver certificate?" for more information.
In circulated condition it has no added value. A nice, crisp uncirculated one is worth about $55 if you can find an interested buyer.
In worn condition, about $5. In better shape, around $10.
$100.00
The value of a 2-dollar bill from the G series, which was issued in 1976, typically ranges from its face value of $2 to around $5 or more, depending on its condition and whether it has been circulated or is uncirculated. Bills in excellent condition or with unique serial numbers can fetch higher prices among collectors. However, G series bills are not rare and are generally not considered valuable in the way that other older currency might be. Always check with a currency collector or appraisal expert for precise valuations.
9.8 is the value for g, which stands for Gravity.
"G" is the Federal Reserve District letter rather than the series letter; if there is one it's next to the date. The fact that your bill is a Federal Reserve Note means it was printed in 1976 or later and is not rare. If you got it in change it's only worth face value.