Double your wealth. Kant Miss Company is promising its investors that it will double their money every $2$ years. What annual rate is Kant Miss promising? Is this investment a good deal? If you invest $$250$ now and Kant Miss is able to deliver on its promise, how long will it take your investment to reach $$28,000?$

Using the Rule of $72,$ what annual rate is Kant Miss promising?

$\%($Round to the nearest whole percentage.$)$