The simple interest on a certain sum for \(2\frac{1}{2}\) years at 12% per annum is Rs. 600 less than the simple interest on the same sum for \(4\frac{1}{2}\) years at 8% per annum. Then, the sum is :
1
Rs. 20,000
2
Rs. 16,000
3
Rs. 10,000
4
Rs. 8,000