Question

If a number is increased by 20% and the other number is decreased by 30%, find the percentage
increase or decrease in the product of the two numbers.​

Answer 1

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 number

Net decrease

×100

=

100

4

×100

=4%

Hence the net percent decrease is 4%.

Hope it helps uh....