A man borrows Rs. 6000 from a bank at simple interest. After 4 years, he paid Rs. 2500 to the bank and at the end of 5 years from the date of borrowing he paid Rs. 4560 to settle the account. Find the rate percent per annum.
1
4%
2
3%
3
3.85%
4
4.5%
5
2.75%