Please show work

3. Five years ago you bought a 5% coupon bond with a 15-year remaining maturity. At that time the bond had a yield to maturity of 6%. Today you sold the bond for $1,250. Given that the bond paid coupons semiannually, what was your effective annual rate of return on this investment? (Assume the first coupon was paid 6 months after you purchased the bond) Answer: 11.7995%