A certain sum P when invested for four years at the rate of 15% p.a. simple interest, amounts to Rs. 26240. What will be the interest earned when (P + 1600) is invested at the same rate of simple interest p.a. for four years?
1
Rs. 10000
2
Rs. 10800
3
Rs. 9850
4
Rs. 12800
5
Rs. 10280