Question

A number is increased by 40%then decreased by 40%.Find the met increase or decrease per cent

Answer 1

Answer:

see this attachment or

Let us assume that the number be 100. At first we have to increase the number by 40%. Then we have to decrease 40% again.

so, firstly, after increase the term by 40% , we have the number be

100 + 100*40/100

= 100 + 40

= 140

Again, we have to decrease the number by 40%. So, the number becomes

140 - 140*40/100

= 140 - 56

= 84

So, we have seen that the number decrease. Now we have to calculate the percentage of the number has decreased.

Assumed number = 100

Present number = 84

So, decrease percentage = 16 % (ans.)

Answer 2

Answer

Step-by-step explanation:

Let the number = x

the number is increased by 40% = x + x×40/100 = x + x × 2/5 = 7x/5

Now , the number is decreased by 40% = 7x/5 - 7x/5 × 40/100

= 21x/25 = 21×4 x/25×4

= 84x/100

= 84% of x

Finally the number we get in the end is 16% decrease by the original number x .