Williamson Inc.'s bonds have a coupon rate of 12% and a par value of $1000. The bonds have 15 years left to maturity. If williamson's bonds are currently selling for $1,430, calculate their yield to maturity. Assume semiannual coupon payments.

-3.1% -7.2% -5.3% -9.8%

My question: are the answers the rate of return already in half, or do you have to divide these by 2 to get the rate of return? Explain.