There were 20 lotus plants in a pond and through reproduction eight new plants are added in two years, taking the current population to 28. How do you calculate the birth rate?
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a
828
b
828×2
c
820
d
820×2
answer is D.
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Detailed Solution
The birth rate is the number of births per individual per unit time.b= ∆NnN ×∆t=820 × 2 = 0.2