A student took 7 tests and had an average of 72. If his average after 8 tests increased to 73, what was his score on the 8th test?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 80.
Total score of 7 tests = 7 × 72 = 504
Total score of 8 tests = 8 × 73 = 584
8th test score = 584 – 504 = 80