The first thing you should do is learn to read error messages. What does it tell you -- that you can't use two strings with the divide operator.
So, ask yourself why they are strings and how do you make them not-strings. They are strings because all input is done via strings. And the way to make then not-strings is to convert them.
One way to convert a string to an integer is to use the int function. For example:
percent = (int(pyc) / int(tpy)) * 100