Of $500$ sessions that occurred on a website during a one$-$week period, $200$ of them started on the homepage; $100$ of these $200$ sessions saw only the homepage before leaving the site. Of the $300$ sessions that started on other pages, $100$ of them consisted of only one pageview. What is the site bounce rate?

$20\%$

$30\%$

$40\%$

$50\%$