Because her test turned out to be more difficult than she intended it to be, a teacher decided to adjust the grades by deducting only half the nuber of points a student missed. For example, if a student missed 10 points, she received a 95 instead of a 90, Before the grades were adjusted the class average was A. What wa sthe average after the adjustment.?
(A) 50 + A/2
(B) 1/2 ( 100- A)
© 100- A/2
(D)(50+A)/2
(E) A+25
Ans is 50+A/2...Please explain !!!!