Dear Jame,
Thank you for your kind words, and for your help this term.
I'm not sure what you mean by 52.11. Are you looking in the right place?
According to what I see, your final presentation should be 25.28 out of 35% of 100.
That means 72.22 out of 100 for the final presentation.
When everything is totaled (Attendance and participation (30%) plus both presentations (35% each) you should have final score of 73.92, which means a letter grade of B.
Please check again and tell me what you see.
Thanks,
Aj. Lars