For which year, the percentage rise/fall in the number of students who left the school compared to the previous year is maximum?

1997

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1998

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1999

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2000

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Solution

The correct option is A. $1997$
The percentage rise/fall in the number of students who left the school (compared to the previous year) during various years are:
For $1997 = [\frac{(450 - 250)}{250} \times 100] % = 80 %$ (rise)
For $1998 = [\frac{(450 - 400)}{450} \times 100] % = 11.11 %$ (fall)
For $1999 = [\frac{(400 - 350)}{400} \times 100] % = 12.5 %$ (fall)
For $2000 = [\frac{(450 - 350)}{350} \times 100] % = 28.57 %$ (rise)
For $2001 = [\frac{(450 - 450)}{450} \times 100] % = 0 %$
Clearly, the maximum percentage rise/fall is for $1997$ .

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