a $15$ year $$1,000$ bond with a coupon rate of $10\%,$ matures in eight years and sells for $$1020.$ what is the expected annual yield to maturity

a $7\mathrm{.}9\%$

b $8\mathrm{.}9\%$

c $7\%$

d $9\mathrm{.}6\%$