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Assume the carrying copacity of the Earth is 27 billion, Use the 1960 annual growth rate of $2.1 \%$ and population of 3 billion to predict the base growth rate and current growth rate with a logistio model, Assume a current world population of 7.8 billion. How does the prodictod growth rate compare to the actual growth rate of about $1,1 \%$ per year?
What is the base growth rate? $\square$ \% (Round to four docimal places as needed.)