90%, A*, A, 1st
15 out of 20 would be grade of 75 percent.
If you get 2 wrong out of 20 then its a 90 percent
90% or A-
Lets say a D+ is approx. a 68. ((88.3*.8)+(68*.2))*100= 84.24%
80% or B-
A or 80 %
You would have a 60%.
As a percentage 18 out of 20 is 90%
(c-) -.2(c-)
80% B
every question is 2 points