Question

A number is increased by 40% and then decreased by 40%. find the net increase or decrease per cent​

Answer 1

Answer:

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:

16%

Step-by-step explanation:

let the number be=100

increase in number by 40%=40% of 100=(40/100)*100=40

increased number=100+40=140

decrease in number by 40%=40% of 140=(40/100)*140=56

decreased number=140-56=84

net decreased in number=100-84=16

% of net decreased in number=(decreased number/original number)*100%

                                                   =(16/100)*100%=16%