A man borrowed a certain sum of money at the rate of 10% per annum simple interest for the first three years and 15% per annum simple interest for the period beyond three years. If he pays a total interest of Rs. 2884.50 at the end of 7 years, then the sum of money (in Rs.) that he borrowed is:
1
3,860
2
3,090
3
4,550
4
3,205