Percentage increase and decrease. On the first quiz of the term (worth 20 points total), a student scored a 5. On the second quiz, he scored a 10. Verify that the percentage increase from the first to the second quiz is 100%. On the third quiz, the student again scored Is there a hidden agenda? 173 a 5. Is it correct to say that the percentage decrease from the second to the third quiz is 100%?