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klemol [59]
3 years ago
14

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
Mathematics
1 answer:
IceJOKER [234]3 years ago
3 0

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\%

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likoan [24]

From the picture, we can see that ΔLSP and ΔLRN are similar, so corresponding sides are proportionate:


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Therefore, the LRN sides is 7/3 of the corresponding side of LSP.


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