An investor purchases a $30-$ year, zero $-$ coupon bond with a face value of $$5,000$ and a yield to maturity of $6\mathrm{.}1\%.$ He sells this bond ten years later. What is the rate of return on his investment, assuming yield to maturity does not change?

A$.6\mathrm{.}1\%$

B$.3\mathrm{.}66\%$

C$.4\mathrm{.}88\%$

D$.3\mathrm{.}05\%$