Question

The population of a city first increased by

10% and then decreased by 20%. The net

degrease in the population is​

Answer 1

Answer:

the decrease is 4%

Step-by-step explanation:

Answer 2

Answer:

HERE is the answer 2%

Step-by-step explanation:

Suppose that

The number to be 100

According to question

Number increased by 20%

100 + 20% of 100

$100 = \frac{20}{100} \times 100$

$100 + 20 = 120$

Then,

Resulting number decreased by its 15%

$⟾120 - (15\% \: of \: 120)$

$⟾120 - ( \frac{15}{100} \times 120)$

$⟾120 - 18$

$⟾102$

Now, net increase = 102 - 100

= 2

$Increase = \frac{net \: increases \: }{original \: number} \times 100$

$Increase = \frac{2}{100} \times 100$

$Increase\% = 2\%$