What grade will I get if... (HELP)

What grade will I get if right now I have 97 and then I get 50 out of 100 on my final which is 10% of my over all grade?

Weighted average:

97 * 0.9 + 50 * 0.1 = 92.3 average.
I'm guessing this 97% average accounts for 90% of your grade.

0.97*90 = 87.3
0.50*10 = 5

You will get 92.3% aggregate.

100 - 90 (A)
89 - 80 (B)
79 - 70 (C)
69 - 60 (D)
59 - 50 (F)