69906
The lowest score I can get, on the Economics exam I just took and still get an A: 78%
The lowest score I can get, and still get a B: 50% < This one is impossible just based upon the fact that I know I got at least 50 out of 78 of the multiple-choice questions correct along with the written problems 100% correct, with a few extra credit questions correct. Suggesting I didn't completely screw this up and get stuck with a B grade, all went well.