Take some time to study and focus on what your keywords means, such as isothermal and reversible in this case.
These key words tell you a lot. And typically in most problems assigned by professors, those key words tell you what one (or more!) of the 4 common values you are asked to find (which, is your case) without doing a single calculations. This then simplifies all your other calculations and you find things start getting much simpler to calculate, even trivial!