Tip calculator app solution - vanilla Javascript

Hello everyone! Hope everyone is having fun with the challenges.

This was a really interesting challenge, was something I had never done before and push me, but not to the point of frustration. I think I'm learning a lot with each challenge.

The thing that is bothering me a little is that I had to reuse a lot the functions so in every event listener I'm adding again all the functions almost. If anyone has a better approach I would really appreciate the help : )

Thanks!