Add HW1-HW4, EX1 for a total of 480pts.
Let this be G=HW1+HW2+HW3+HW4+EX1
Boundaries overlap.

355<=G <=480  A
280<=G <=355  B or B+
210<=G <=280  C or C+
     G <=210  F 


Oct 30, 2021.