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If there are 250 snails in a pond, and within a year their number increases to 2500 by reproduction. What should be their birth rate per snail per year?
A
10
B
9
C
25
D
15
Detailed Solution
Increase in population $=2500-250=2250$. Birth rate per capita $=\dfrac{2250}{250}=9$ per snail per year.