Question

In a school, some students from section A were shifted to section B of class X, and thereby, the number of students in section B increased by 12%. But at a later stage, all of them were shifted back to section A. By what percentage (correct up to two decimal places) did the number of students in section B decrease?  

Options

• 12%

• 10.71%

• 11%

• 0%

Answer 1

10.71%

Explanation:

Let the number of students in 'B' is '100'

After some students shifted from 'A' number of students in B increased to 12 %

Student in 'B' = `100 xx (100 + 12)/100`

= 112

Now, '12' student shifted back to section 'A'.

Students of section 'B' decreases by = `12/112 xx 100`

= 10.71%