A number is first increased by 10% and then decreased by 10%. Then net percentage increase or decrease in the number is:
Answer & explanation
Correct answer: option 1
10% fraction = 1/10, then
If increase the fraction will be 11/10 and,
If decrease the fraction will be 9/10.
old value New value
+ 10% 10 11
- 10% 10 9
------------------------------------
100 99
Net decrease change = (100 - 99)/100 × 100
⇒ Net decrease change = 1/100 × 100 = - 1%