Question 874345
The function for an average is:
(sum of terms)/(number of terms)
Because everything else is worth 9 units, compared to 10%,
(9*78+x)/10=80
Multiply both sides by 10
9*78+x=800
702+x=800
Subtract 702 from both sides
x=98
<h3>You'll have to get 98% on the final</h3>