A certain sum amounts to ₹17,925 in 3 years and to ₹21,825 in 7 years at the same rate per cent per annum at simple interest. What will be the simple interest (in ₹) on a sum of ₹18,500 for 4\( {2 \over 5}\) years at double the earlier rate?
1
10,582
2
8,245
3
9,876
4
7,625