We have extra credit on virtually every single quiz in Latin - I actually got a 147% on my last Latin Quiz. That's why my average is what it is - all of my percentages (homework, tests, quizzes, participation, etc) are all >100.
Unfortunately, our school doesn't put that on our transcript. If I maintain my 110 until the end of the quarter, which is next week - It'll just be a 100 on my report card.
C'est la vie.