Question

the population of a city first increased by 10% and then decreased by 20% .the net decrease in the population is​

Answer 1

Answer:

12%

Step-by-step explanation:

+10-20-(10*20)/100

=10-20-2

=10-22

= -12%

Answer 2

Step-by-step explanation:

let be the populationof a city is =x

x+x×10

------

100

x. 10x. 110x

=> ---. +. -----. =>———

1. 100. 100

decrease by 20% =>110x. -—20. ×110x

--------. ------. -------

100. 100. 100

=110x. -. 22x

-------. -------

100. 100

= 88x

-------

100

x-88x. 12x

————. =———

100. 100

decrease %=12x

--------

100

---------------- ×100 =12%

100×x