The annual birth and death rates per 1,000 are 39.4 and 19.4 respectively. The number of
years in which the population will be doubled assuming there is no immigration or emigratior
is
(a) 35 years.
(b) 30 years.
(c) 25 years
(d) none of these
Answers
Answered by
16
Answer:
35 Years
explanation:
The annual birth and death rates per 1,000 are 39.4 and 19.4 respectively. The number of years in which the population will be doubled assuming there is no immigration or emigration is
Let say population = 1000P
Birth - 39.4P
Death = 19.4P
Increase = 39.4P - 19.4P = 20P
Rate of increase = 20P/1000P * 100 = 2%
Double population = 2000P
2000P = 1000P ( 1 + 2/100)ⁿ
=> 2 = (1.02)ⁿ
=> log2 = nlog(1.02)
=> 0.301 = n(0.0086)
=> n = 3010/86
=> n = 35
in 35 Years Population will be doubled.
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