hmmm this is an interesting question. here is what I'm thinking
that seems like the logicly correct answere.
and that look like what you did. so I'm guessing that is the correct way.
i mean you only got a slightly diffrent answere, but you probly don't the exact numbers so if they get rounded then you'll get a lil diffrent numbers........maybe lol
eidt:
umm just out of curiostiy why in the hell are you wondering this?? heheheh :P