Simple CMS for About Us, Product Page,ETC via PHP/MYSQL

I need a simple CMS that has the following requirements: 1. a login for the CMS 2. a CMS of About Us, Products, Services, Contact us, using FK Editor or something like FK Editor that can easily be integrate to an HTML. 3. can use include function if needed. 4. can easily be integrate to the page that has been done using html. Budget is only 50USD.