Question

a number is increased by 20% and the increased number is decreased by 20%.find the net increase or decrease percentage

Answer 1

Answer : 4% decreased

Solution :
_________

Given that : A number is increased by 20% and increased number is decreased by 20%

$x + y + \frac{xy}{100}$

where x = increased% and y = decreased%

$20 - 20 - \frac{20 \times 20}{100} \\ \\ = > - 4$

So, net decreased% will be 4%

Answer 2

4 % decrease
suppose you have ₹100
100+ 20% of 100 = 120
now 20% of 120 =24
120-24 = 96
100-96 = 4
4 is 4% of 100