97 is 90%
97x .9 = 87.3 is your final grade with a 0 which counts 10%
It's a weighted average
97x9 + 0x10 = 873 divide by 10 to get the final grade, the weighted average = 873/10 = 87.3, a B, maybe B+. It could have been an A or A+
If there's no + and - grades, and you "just" want an A, then you need a 90, or maybe an 89.5 weighted average.
97x9 + Gx10 = 900
873 + 10G = 900
10G = 900-873 = 27
G = 2.7 is the necessary grade to get a final grade of A
or if they round up
87x9+Gx10 = 895
873 +10G = 895
10G = 895-873 = 22
G = 2.2 or 2 1/5 is all you need for an A
It's not worth taking a zero. Do multiple choice with a Christmas Tree answer and you get an A
