Calculate percentage in JavaScript

Here I'll show you how to calculate percentage using JavaScript. The steps I use are pretty simple and anyone with a basic understanding of HTML and JS can grasp them. I have used so many variables for the sake of ease and legibility.

Also, don't pay attention to the CSS, I did that beforehand just to make it look better. :P

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Music:
TheFatRat - Fly Away feat. Anjulie