Calculator challenge questions about some buttons functionality


So I wonder what does CE and % buttons do?


CE - Clear the last Entry.
% - percentage, for calculating percentage


Can you tell how do I calculate percentage? I mean I know how to calculate them mathematically I just wonder how it works with calc say I want to know 50% of 100 what do I press first and which numbers I enter?

Edit. you already gave link to my question :smiley: thanks a lot.