The perplexing bat-ball riddle - How much is the ball ?

You can baffle most people with this number puzzle, because at first you guess the wrong solution. But I'll show you how you can easily find the right solution with a little maths.
Subtitles are available

[@comeasyouare92]

Wahnsinn wie einfach das ist.
Aber bei der Frage alleine, steht man erstmal dumm da.

[@stefanriegel2963]

Ja, deshalb liebe ich Mathe !