Question

Manoj income increased by 20% and then it is decreased by 20% what is the total percentage change in Manoj income

Answer 1

let his income be rs 100
after increase = 20% of 100 + 100
                         = 20+ 100= rs 120
afte decrease = 120 - 20%of 120
                       = 120 -24 = rs 96
net decrease= 100-96= rs 4
% = 4/100 x 100
    = 4%

Answer 2

Answer:

4%

Step-by-step explanation:

Let Manoj's initial income be x.

And now, his income got increased by 20%.

So 20% of x = x/5.

Now total income of Manoj is x+x/5= 6x/5.

Then again, his income got decreased by 20% of present income.

Therefore 20% of 6x/5 is 6x/25.

Therefore Manoj's present income is

6x/5 - 6x/25= 24x/25.

So, net decrease from his present income is

x - 24x/25=x/25 .

To calculate the percentage of net decrease:

In Rs x net decrease is x/25.

In Rs 1 net decrease is 1/25.

In Rs 100 , net decrease is 100/25 = 4%

Therefore Manoj's net decrease in percentage from initial income is 4%.