The answer would depend on the eighth question of WHAT! And since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
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If you have 25 questions than you take 25x4 so the questions would be worth 4 points. So if you miss 2 than your percentage is 92%
An infinite number, since points take up no space.
One hundred points are equal to one carat.
To measure an angle you must take all the points in between the two. Therefor it could be anywhere from 2 to 100 points.
They work out the stupid questions like how many sperm cells does it take to change a lightbulb