The strength of a school increases and decreases in every alternate year by 10%.

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Question

The strength of a school increases and decreases in every alternate year by 10%. It started with increase in 2000. Then the strength of the school in 2003 as compared to that in 2000 was

Options:

A . decreased by 8.9%

B . decreased by 9.8%

C . increased by 9.8%

D . increased by 8.9%

Answer: Option D
Answer: (d)
Using Rule 4,
If a number is increased by a% and then it is decreased by b%, then the resultant change in percentage will be $(a - b - {ab}/100)$% (Negative for decrease, Positive for increase)

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