That's very cool! But there is one problem: YOU NEED to paste this:
internet = round(internet, 1) into buy_internet(function)'s if(before intlabel.configure(text=f"Internet: {internet} GB")!!!!!!)
2) into work()'s if ( like in previous before intlabel.configure(text=f"Internet: {internet} GB")!!!!)
I am asking you to do it because if won't do these steps your internet will be
7.0000000000000000000001 GBs