The Public Provident Fund (PPF) is a popular long-term investment option in India due to its attractive interest rates and tax benefits. What is the current interest rate offered on PPF accounts in India? How often is the interest rate updated, and who determines it? Additionally, how does the interest rate impact the overall returns on a PPF account, and are there any recent changes or announcements related to PPF interest rates? Please provide details on the latest interest rate and its effect on investments.