Question

A number is increased by 20% and then it is decreased by 10%. Find the net
increase or decrease per cent.​

Answer 1

Step-by-step explanation:

Let the number be =100

Increase in the number =20% of 100

=

100

20

×100

=20

Increased number =100+20

=120

The resulting number decreased by 20%

Decrease in the number =

120

20

×120

=24

New number =120−24

=96

Now, net decrease =100−96

Net % decrease= original no./net decrease ×100

400/100× 100 =4%

net decrease% is 4%