If a person makes monthly investment of ₹12,500 in Public Provident Fund (PPF), total contribution over 15 years, at interest rate of 7.1% per annum, becomes ₹22.50 lakh. It boosts maturity value to ₹40.68 lakh and in extended period after maturity, this corpus alone can generate annual interest of up to ₹2.88 lakh, translating into monthly payout of around ₹24,000.