What % do I need to pass Sociology? (pic included)

Hey everyone. Because I'm terrible at math, I don't know what the minimum grade I need to get on my college sociology exam to pass. The minimum I need is a 70% C-

The total for the entire class (points possible) = 420points
*The "assessments" grade will be a 20/20*

Please take a look at the Flickr pic i took, it will explain all my current grades. So, again, I need a minumum of a 70% in the class to pass. Whats the minumum I need on this exam?

Thanks so much! Link: http://www.flickr.com/photos/44358716@N0…

You have 420 out of a possible 540 which means for the course so far you are on 63% obviously 7% left with a possible 18% at to get the first left is only worth 3% so if you get zero on that then you'll need at least 46% (7/15) on the final to get 70%.
(mark gained/ total possible) x 100 = grade percentage

75%