To build ₹4-crore corpus in 25 years, NDTV profit suggested investing in PPF, mutual funds and gold. Monthly SIP of ₹6,000 with annual step up of 10% for 25 years will give total value of ₹2,56,53,276. Monthly investment of ₹6,000 in gold for 25 years will return ₹74,58,957. Annual ₹1 lakh investment for 25 years in PPF will return ₹68,72,010.