A certain sum amounts to Rs. 13200 after 4 years and to Rs. 16400 after 8 years at the same rate per cent p.a. at simple interest. The simple interest (in Rs.) on the same sum at 10% p.a. for \(3\frac{1}{5}\) years will be:
1
4000
2
3200
3
2500
4
3500