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In a certain school the student body has one-fifth seniors. If all the

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In a certain school the student body has one-fifth seniors. If all the students were at a pep rally and forty percent of the seniors left the pep rally early, what was the percent change in the number of students at the rally?

A. 8%
B. 12%
C. 20%
D. 40%
E. 60%

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Re: In a certain school the student body has one-fifth seniors. If all the  [#permalink]

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New post 23 Dec 2017, 07:11
Bunuel wrote:
In a certain school the student body has one-fifth seniors. If all the students were at a pep rally and forty percent of the seniors left the pep rally early, what was the percent change in the number of students at the rally?

A. 8%
B. 12%
C. 20%
D. 40%
E. 60%


Before the seniors left, the proportion of all students was: \(Students.Before=Seniors+Others=\frac{1}{5}+\frac{4}{5}=0.20+0.80=1\)

After the seniors left, the proportion of all students was: \(Students.After=Seniors+Others={\frac{1}{5}*(1-\frac{2}{5})}+\frac{4}{5}=0.20*0.60+0.80=0.92\)

The percentage change is: \(\frac{Before-After}{Before}=\frac{1-0.92}{1}=0.08=\)\({8%}\)

(A) is the answer.
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In a certain school the student body has one-fifth seniors. If all the  [#permalink]

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New post 23 Dec 2017, 10:32
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Bunuel wrote:
In a certain school the student body has one-fifth seniors. If all the students were at a pep rally and forty percent of the seniors left the pep rally early, what was the percent change in the number of students at the rally?

A. 8%
B. 12%
C. 20%
D. 40%
E. 60%



Assume the total number of students to be 1000.

As the student body has one-fifth seniors, the number will be 200.
Since 40% of the seniors left the pep rally, 40% of 200 or 0.4*200 = 80 seniors leave the pep rally.

Hence, the percentage change of number of students in the pep rally will be from 1000 to 920 (8% - Option A)

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In a certain school the student body has one-fifth seniors. If all the &nbs [#permalink] 23 Dec 2017, 10:32
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