This document discusses how an average family spending Rs. 15,000 per month today can prepare for retirement in 15 years when their expenses are expected to be Rs. 62,000 per month due to inflation. Investing Rs. 15,000 per month in different instruments like equity mutual funds offering average returns of 18.75% can generate around Rs. 2 crore 79 lakh in 15 years. Investing this amount at 8% interest would provide Rs. 1.86 lakh in monthly interest income, enough to cover expected monthly retirement expenses of Rs. 62,000 and have Rs. 1 lakh remaining to invest or spend each month without having to work. The key is to spend equal to what you invest now so