SSC GD Constable 22 Nov 2021 Shift 2 Paper

The rate of interest on a sum of money is 8% p.a. for the first 3 years, 10% p.a. for the next 4 years and 12% p.a. for the period after 7 years. If a person gets ₹ 13795 as simple interest after 12 years, then how much amount (in ₹) did he invest?