help with annual interest rate

An uncle asks to borrow $5,000 today and promises to repay you $9,210 four years from now. What annual interest rate would you be agreeing to? 16.5% 18.1% 12.3% 13.5% An uncle asks to borrow $5,000 today and promises to repay you $9,210 four years from now. What annual interest rate would you be agreeing to? 16.5% 18.1% 12.3% 13.5%