HORTICULTURE SCIENCE
DISEASE AND PEST MANAGEMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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1.4 years
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14 years
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140 years
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35 years
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Detailed explanation-1: -For example, it would take a population 14 years to double at a growth rate of 5% per year, and that can be found using the doubling time formula. The formula can be simplified to the Rule of 69, Rule of 72, and Rule of 70 using assumptions and applying them to particular scenarios.
Detailed explanation-2: -There is an important relationship between the percent growth rate and its doubling time known as “the rule of 70”: to estimate the doubling time for a steadily growing quantity, simply divide the number 70 by the percentage growth rate.
Detailed explanation-3: -If an economy grows at 2% per year, it will take 70 / 2 = 35 years for the size of that economy to double.
Detailed explanation-4: -If we use the exponential growth model P(t)=P0(1+r)t with r = 1, we get the doubling time model.