A: Excuse me, Professor. I think there might be an error in my test score.

B: Sure. Do you think that the total is wrong or that you got something marked wrong that should have been marked right?

A: I think that the percentage is incorrect.

B: Let's just go over all of it to double-check.

A: Sure, let's do it.

B: Here is the answer sheet. Do you see a place where I marked something wrong that should have been right?

A: I don't see any mistakes.

B: OK, now that we've gotten those straightened out, let's total the score.

A: Yes, let's total it.

B: Well, if I total that like this and divide by this number, I get this total. Do you agree?

A: Yes, you're right.

B: Well then, we are all straight. Have a good day and thanks for bringing that to my attention.