An investor was afraid that he would become like King Lear in his retirement and beg hospitality from his children, so he purchased grain "tithes," or shares in farm output, for $1,000$ pounds. The tithes paid him $100$ pounds per year for $30$ years. What interest rate did he receive on this investment?

$10\mathrm{.}44\%$

$9\mathrm{.}31\%$

$6\mathrm{.}93\%$

$8\mathrm{.}14\%$

$11\mathrm{.}55\%$