A player’s average test score on 4 tests is What must be his score on a 5th test for average score on 5 tests to be 80?

A 82

B 84

C 86

D 88

Correct Answer: Option D

Let the score in the 5th test be x. The sum of the first 4 tests = 78 X 4=312 Now it implies ,

312+x/5=80 Therefore, x=88