A sum of Rs. 1000 is lent out in two parts in such a way that the simple interest on one part at 10% per annum for 5 years is equal to that on another part at 12.5% per annum for 4 years. The sum lent out at 12.5% is?
1
Rs. 500
2
Rs. 475
3
Rs. 750
4
Rs. 250