A certain sum amounts to Rs. 14,641 in 4 years at 10% p.a., when the interest is compounded annually. What will be the simple interest on the same sum in \({3\frac{1}{2}}\) years at the same rate of interest?
1
Rs. 4,200
2
Rs. 3,000
3
Rs. 2,800
4
Rs. 3,500