Excuse me, Professor. I think there might be an error in my test score.
Sure. Do you think that the total is wrong or that you got something marked wrong that should have been marked right?
I think that the percentage is incorrect.
Let's just go over all of it to double-check.
Sure, let's do it.
Here is the answer sheet. Do you see a place where I marked something wrong that should have been right?
I don't see any mistakes.
OK, now that we've gotten those straightened out, let's total the score.
Yes, let's total it.
Well, if I total that like this and divide by this number, I get this total. Do you agree?
Yes, you're right.
Well then, we are all straight. Have a good day and thanks for bringing that to my attention.