Question

a number is increased by 20% and then decreased by 20% find the net increase or decrease percent

Answer 1

When a number for example :- 1 is incresed by 20% , then it will become 20% . But when we decrease 20% from final number , then it will become again 1.

Answer 2

let the number be x 
first , number is increased by 20%
x becomes  x + 0.2x = 1.2 x 

now , number 1.2 x is decreased by 20% 
x becomes 1.2x - 0.2 x 1.2x = 1.2 x - 0.24x = 0.96 x 

net increase or decrease percent =  (0.96x - 1.2x /1.2x)x 100

= (- 0.24 / 1.2) x 100 = 0.2 x 100 = -20%     - sign indicates decrease


so , your answer is 20%

plzzzzz mark brainliest