It might still say 5 cents if the problem was "the bat costs 90 cents more than the ball", since 5 cents is overwhelmingly the right answer to questions that look like this.
That's a great conversation. I anthropomorphically feel bad for Gemini, in that it actually got a hard question right, and then it was gaslit into believing it was wrong.
https://g.co/gemini/share/94238c5ed174 / https://archive.is/ZTkjI