A man has Rs. 10,000. He lent a part of it at 15% simple interest and the remaining at 10% simple interest. The total interest he received after 5 years amounted to Rs. 6,500. The difference between the parts of the amounts he lent is:
1
Rs. 1,750
2
Rs. 2,500
3
Rs. 2,000
4
Rs. 1,500