You bought one of Great White Shark Repellant Co.s 11 percent coupon bonds one year ago for $770. These bonds make annual payments and mature 13 years from now. Suppose you decide to sell your bonds today, when the required return on the bonds is 13 percent. If the inflation rate was 3.1 percent over the past year, what was your total real return on investment?

If you don't mind can you break down how you got the answer please? My book don't explain to much on how it found the answer.