# Calculus

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The population of a county increases at a rate proportional to the existing population. If the population doubles in 20 years, then the factor of probability is

a) 2e^(-30)
b)1/2(ln 20)
c)ln 2
d)1/20(ln 2)
e)ln 20

• Calculus -

I have no idea what a "factor of probability" is
p = Pi e^kt
2 = e^20k
ln 2 = 20 k
k = (1/20) ln 2

• Calculus -

thanks

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