Every assignment is worth 100 percentage points, with each question worth an equal percentage of the total. Short answers are worth the same percentage as multiple choice questions.
So if there are 4 questions, each is worth 25%. If there are 5 questions, each is worth 20%.
Short answer questions and multi-select multiple choice questions can have partial scores. If there are 4 questions and 1 is a short answer, that short answer is worth 25%, and a 2 out of 4 on that short answer would equal 12.5% out of a possible 25 percentage points.
Finally, we only count Part B questions when the students get Part A correct. So if there are 4 questions and #1 is Part A and #2 is Part B, and the student gets Part A right and Part B wrong (and number 3 and 4 correct), then the student gets a 75%. But if the student gets Part A wrong (and 3 and 4 correct) then the student can only get a 67% because we only count questions 1, 3, and 4 towards their total score. We drop Part B from the total regardless of whether they get it right or wrong.
On the assignment report, correct answers are green, incorrect answers are red, and omitted part b results are gray. Yellow multi-select answers mean students got one of the two answers correct. Short answers can be graded on a scale from 0 to 4, and are shown in shades of blue on the assignment report.