If there are 250 snails in a pond, and within a year their number...

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?

Options

A $25$
B $15$
C $10$
D $9$

Correct answer

D. $9$

Step-by-step solution

Birth rate

=\frac{\Delta \mathrm{N}}{\mathrm{N} \Delta \mathrm{t}}

Here,

\quad N=250

\Delta t=1

year

\Delta N=2500-250

=2250

Birth rate

=\frac{2250}{250 \times 1}

=9

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