grade (469) = hw1 (67) + hw2 (69) + ex1 (333)

 if the semester was to end today and  you had submitted
hw1, hw2 and took the exam ex1, and I were to report 
letter grades these would roughly  be as follows.
  A region            :  350-469
  B region (B or B+)  :  250-350
  C region (C or C+)  :  210-250
  D region            :  170-210
  F region            :  0  -170

Nov  1, 2016