Good morning.

This might be a somewhat stupid question, but... I did search first to see if I couldn't find the answer before this point.
I'm scheduled to take the 70-536 exam a week from tomorrow, and have been preparing for this for a few months now. (I've been dragging my feet.) I'm more accustomed to the Sun Java exams, where passing is expressed as a percentage rather than some seemingly arbitrary score. I do understand that there are 45 questions on the exam, and that passing is "700"... but what I'm wondering is, how is the score calculated? Basically, how many of those 45 questions do I have to get right to pass?

And, as a side note... how hard, relatively, is this exam actually?
Thanks!