The rule is this (i think):
If you fail the final exam but still acheive a composite mark >50, then you will pass the course, unless it is in your course outline that you need to pass your final.
For Accounting 1A, when I did it last year, you could fail the final, but still pass the course overall. However, in our first lecture of 1B, the Lect in Charge told us that for 1B you MUST pass the final, and that lots of 1A students that failed the final were still passed.
So, safest thing to do is to check the course outline. Either that, or don't fail your final. Good Luck everyone.