SSC CPO Tier 1 Exam 04 Oct 2023 Shift 2

Ramesh borrowed Rs. 15,000 at a certain rate of simple interest from a bank. He repaid (the principal but not interest) Rs. 6,000 after 5 years, and after 5 more years he paid Rs. 18,600 and settled his account. Find the rate of simple interest per annum.