To build a corpus of ₹1 crore with the 15x15x15 rule of mutual funds, a person has to invest ₹15,000 through SIP each month over a period of 15 years, considering a 15% annual return from an equity mutual fund. In 15 years, the investment will give a return of ₹1.0-1.02 crore with a total investment value of ₹27 lakh.