Question 161204
First half had 120 total points and you got 81%. So you got {{{120*0.81}}} = {{{97.2}}}

The total points for the whole year are {{{120+140}}} = {{{260}}}
In order to get a full year grade of 80%, you would need to score {{{260*0.8}}} = {{{208}}}

Since you already have 97.2 points in the first half, you'll need {{{208-97.2}}} = {{{110.8}}}. Not sure how you get .8 points, so go get {{{111}}} in the second half