India has a federal structure of Government, comprising of a union of 28 states and seven union territories.
Each Indian State has its own independent Govt. and then there is an collective Union (Central) Government at the Center.
Seven schedule to the Constitution of India distributes legislative powers between Parliament (Union Govt.) and State legislatures (State Govts), and it comprises of three lists, namely:
List I - Union List,
List II - State List, and,
List III - Concurrent List.
The Union government is empowered to make laws in areas specified on the Union list, the State Governments are empowered to make laws in areas specified on the State list, and laws in areas listed on the concurrent list may be made at either a State or Union level.
Now if a citizen wants to seek information from a Public Authority, the applicable RTI Rules & Fees would depend upon the fact, that under which of the above mentioned three Lists does a particular Public Authority fall, as follows:
RTI on a subject enlisted in List I - Union List:
An applicant will have to follow the Central Govt. RTI Rules & Fees, irrespective of the geographical location of the Public Authority.
RTI on subject enlisted in List II - State List:
An applicant will have to follow the particular State Govt's RTI Rules & Fees.
RTI on a subject enlisted in List III - Concurrent List:
Then it would depend upon whether the Central Govt. or a State Govt. has made laws for the subject.
Hope this helps.