I can simply give you an answer if you this is a practical problem. if you are a student, however, a simple answer will do you no good when you get to your test. It looks sort of like a class problem so I am guessing you are a student. In that case, do you know the formulas for future and present value of annuities? Can you see how to set this up in excel? Either method will work.
I suspect it's best to use the formulas because that is what you will have available on a test. If you know the formulas, what's your best guess on how to use them?