Question

10. A number is first increased by 20% and then decreased by 20%. What is the net
increase or decrease percent?​

Answer 1

Answer:

Let the no. be 100.

The original increased no.:-

120/100*100=120 (20% of 100+100=120)

120% of 100 = 120

The new decreased no.:-

80% of 120=80/100*120=96

Original no. is bigger than new no.

Thus, net decreased=(100-96)%=4%

Answer 2

Answer

20%increse so we add=+. 1

20%decrease so we subtract=---- 2

on ading equation 1&2 -&+ makes -so

+20%-20% we cancel out get -1 --- get

from 3 line