Hi, I approached this problem as following: 600 = d x 2 x k/100 (Given and rephrasing in pnr) Let's say, to get an interest of 2400 after 3 years, the principal amount invested is P 2400 = P x 3 x k/100 Dividing this by 4(as our goal is equate to above equation) 600 = P/4 x 3 x k/100 = d x 2 x k/100...