Adams Enterprises' noncallable bonds currently sell for $$1,470.$ They have a $15-$ year maturity, an annual coupon of $$80,$ and a par value of $$1,000.$ What is their yield to maturity?

a$.4\mathrm{.}21\%$

b$.5\mathrm{.}01\%$

c$.4\mathrm{.}25\%$

d$.3\mathrm{.}82\%$

e$.3\mathrm{.}37\%$