A common stock will pay a $$4\mathrm{.}00$ dividend, expected to grow at $2\mathrm{.}5\%.$ If an investor pays $$45$ for the stock, what is the implied required return?

$11\mathrm{.}39\%$

$11\mathrm{.}18\%$

$10\mathrm{.}84\%$

$10\mathrm{.}10\%$

none of these