Question 1112273
75*0.72=54 points
75*0.76=57 points
121/150 is 80.67%, rounds to 81%, assuming the 81% is on the final.
If each question is 1.5 points, then 80 questions were answered correctly and partial credit would have been given for the other.
To get an 86% for the final would require 150*0.86=129 points, or 8 more.
To get an 86% for the course would require 258 total points, of which you have 111 from the first two and would need 147 on the final, or 98%.