Question

A city has 20000 residents. Its population grows at the rate of 10% per annum, what will be its total population after 5 years?
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Answer 1

Answer:

30,000

Step-by-step explanation:

According to the information provided in the question it is given as

Total resident =20000 population

Increased at 10 % per annum

We need to find the total population after 5 years

Here we first find the 10% of 20000

$\frac{10}{100}\times 20000\\=10\times 200\\=2000$

( As 100 and 20000 are divisible by 100)

So  (2000 ) is the population grow rate of 10% per annum

Hence grow in 5 years = 5 x2000

                                       =10000

Now

Population after 5 years= actual  + increased in 5 year at 10%

Putting the value we get the answer

                                       = 20000 + 10000

                                       = 30000

Hence total population after 5 year at a growth of 10% per annum =30000

Answer 2

Answer:

Step-by-step explanation

for the first year it will increase by 2000 = 20000 + 2000 = 22000

for the next year it will increase by 2200 = 22000 + 2200 = 24200

for the thirst year it will increase by 2420 = 24200 + 2420 = 26620

for the forth year it will increase by 2662 = 26620 + 2662 = 29282

and for the last year it will increase by 2928.2 = 29282 + 2928.2 = 32210.2

therefore after 5 years the population of the city will be 32,210.2