growing at the same rate, we have
P(t) = 70000* 2^(t/20)
So, you want P(5*12) = P(60) = 70000*2^3 = 560000
The population of a southern city follows the exponential law. If the population doubled over 20 months and the current population is 70,000, what will the population be 5 years from now
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