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

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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.

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