I buy a bond that promises to pay $$1,000$ cash to me in $10$ years and pays an annual coupon of $$80,$ and I pay $$800$ for that bond today. What is the implied annual interest rate?

Question $9$ options:

$12\mathrm{.}50\%$

$2\mathrm{.}50\%$

$25\%$

$10\%$