On August 1, 2013, sellerspace.com was visited by 150,000 users. The number of users who interacted with at least one page on the website was 150,000, the number who interacted with at least two pages was 120,000, at least three pages was 75,000, and four or more pages was 20,000. What was the bounce rate of the website on August 1, 2013?