Increase or Decrease as Percent

Suppose two group of children are playing in a park.

And, each group has children and we named the group as and .

After some time two more children come and join the group .

Now, the number of children in group are increased by .

And, after some time children left from group .

So, the number of children in group decreased by .

In the above situation, we observe that the number of children in one group increases while in other group decreases.

The increase and decrease can be defined in terms of percentage.

Percentage is defined as representing values in fraction where denominator is always . For ex

Let’s try to find the increase or decrease in percent

Here, in first group the number of children is increased by .

So, the change in number of children is .

Then, using this formula percentage increase is calculated.

So, the increase in number of children is .

Therefore, we can say there are more children in group A than earlier.

Now, let’s consider group , where children left the group.

Here, the change in number of children is,

And, we can find decrease as,

So, the decrease in number of children is

So, there are less children in group than before.

Revision

Percentage is defined as representing values in fraction whose denominator is always . For ex

We can find percentage increase as,

And, percentage decrease can be calculated as,

The End