A number is first increased by 30% and then decreased by 30%. What is the net percentage change?
Show answer & explanation
Correct answer: A
Explanation
Given:
First a 30% increase and then a 30% decrease.
By the formula:
Respective percentage change = a + b + (ab / 100)
a = 30
b = −30
Total change = 30 − 30 + (30 × −30 / 100) = −9%