% score in quiz is off by several points

I have a quiz in one of my titles that's 10 questions long, and requires a 90% or better score to pass.


Whenever someone takes the quiz though, the final score is never a multiple of ten, as you'd expect it to be. If I get 7 of 10 correct, it gives me a score of 69%; 8 of 10 gives me an 85%. What gives?


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