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Question

In 2005 for each of the 14 million people present in a country,0.028 were born and 0.008 were died during the year. Using exponential equation the number of people present in 2015 is predicted as

A
A) 25 millions
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B
B) 17 millions
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C
C) 20 millions
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D
D) 18 millions
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Solution

The correct option is B B) 17 millions
ΔNΔT=rN
as we know that
r=bd (b=birth d=death)
r=0.0280.008
=0.020
N= initial population =14 million
ΔNΔT=0.020×14 million
ΔT=20152005 year
=10 year
ΔN10=2.8 million
ΔN=2.8 million
ΔN=NfNi=2.8
Nf=ΔN+Ni
=2.8+14=16.8 million
=17 million

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