1.  For which year, the percentage rise/fall in the number of students who left the school compared to the previous year is maximum?
A. 1997
B. 1998
C. 1999
D. 2000
E. 2001

Answer: Option A

Explanation:

The percentage rise/fall in the number of students who left the school (compared to the previous year) during various years are:

For 1997 =[(450 - 250)x 100]% = 80% (rise).
250

For 1998 =[(450 - 400)x 100]% = 11.11% (fall).
450

For 1999 =[(400 - 350)x 100]% = 12.5% (fall).
400

For 2000 =[(450 - 350)x 100]% = 28.57% (rise).
350

For 2001 =[(450 - 450)x 100]% = 0%.
450

Clearly, the maximum percentage rise/fall is for 1997.