Question

Compare the average score of a student at the beginning of a month and at the end of that month, if at first, it increased by 40%, then decreased by 25%
HELP PLEASE iM DUMB

Answer 1

Answer:

Increased by 5%

Step-by-step explanation:

Let at the beginning the student's score be $s$ points.

At first, it increased by 40%. So, the new score is

$s+0.4s=1.4s$

Then it decreased by 25%, so the new score is

$1/4s-0.25\cdot 1.4s=1.4s-0.35s=1.05s$

At the beginning of a month the score was $s$ and at the end of that month the score was $1.05s$. Since $1.05>1,$ the score increased by $1.05-1=0.05=5\%$