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during two years, the population of birds of an island became 7 times more than before. if the first year increase in the population was 40% , what was the percent increase of the second year?

The percentage increase in bird population in the second years is 4%  .

Step-by-step explanation:

Given as :

During two years, the population of birds of an island became 7 times more than before.

The the percentage increase in first year = = =40%

Let The percentage increase in second year =   = r%

So, According to question

The initial population of bird = x

The increase population of bird =7 times before = 7 x

Now,

The increase population of bird = initial population of bird × (1+ ) ×  (1+ )

Or, 7 x = x × (1+ ) ×  (1+ )

Or, = 1.4 ×  (1+ )

Or, 7 = 1.4 ×  (1+ )

Or, = (1+ )

Or, 5 = (1+ )

Or, (1+ ) = 5

Or, = 5 - 1

Or,   = 4

∴ r = 4 × 100

I.e r = 400

so, The percentage increase = r% = 4

Hence The percentage increase in bird population in the second years is 4%  . Answer

abde or 1,2,4, 5 is the answer

step-by-step explanation:

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