Would your answer be different in (i) above, if invoice for the same was raised on 25.09.2024 instead of 25.11.2024 ?

In this case, payment date will be considered as 16.09.2024 because it is earlier than credit in bank. If payment is not credited in bank within 4 working days after change in rate, then we have to consider the date of credit in bank account as date of payment, but here payment already credited in bank account before change in rate so normal provision will be applicable. Accordingly, time of supply shall be the earlier of the date of receipt of payment i.e. 16.09.2024 or date of issue of invoice i.e. 25.09.2024. So, the time of supply will be 16.09.2024 and rate will be 5%.