How long will it take for a sum of money to grow from Rs.1250 to Rs.10,000, if it is invested at 12.5% p.a simple interest ? November 25, 2023 – by admin 0A. 56 yearsB. 57 yearsC. 65 yearsD. 45 years1250 has become Rs. 10,000. Therefore, the interest earned = 10,000 – 1250 = 8750. => n = 700 / 12.5 = 56 years.