"Total Points" Available

I have created a column showing your "Total Points" on the Blackboard grades,

Right now, the total is out of a possible 600, so an "A" would be 540 points or more, a "B" would be 480 or more, and a "C" would be at least 420 points.

Of course, if you missed one of the exams, your points will be out of 400, rather than 600, so just divide your points by 600 to figure your approximate percentage (A=90%, B=80%, C=70%, etc.). Remember that this could change dramatically, though because the final will count as 40% of your total grade.