If a person is currently earning ₹10,00,000/year, wants to retire at 60 and expects to live until 85, then, according to 80% rule, they will need ₹8,00,000/year for 25 years. This means the person needs approximately ₹2 crore in total savings for retirement (₹8,00,000 × 25 years). However, this can vary based on their lifestyle, health needs, and other factors.