The total investment in 25 years will be Rs 45 lakh. If you get 10% interest on this amount, you will get Rs 1,55,68,356 from the interest. Accordingly, a corpus of Rs 45,00,000 + 1,55,68,356 = Rs 2,00,68,356 will be accumulated. 60% of this amount, i.e. Rs 1,20,41,013, will be available as a lump sum. The remaining 40%, i.e. Rs 80,27,342, will be the annual amount. Assuming that you get 8% interest on this, you will get a monthly pension of Rs 53,516.