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# How do you calculate population growth?

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**Subtracting a past population value from the present population value, and dividing this result by the past population value, yields the population-growth rate.** Multiplying the population-growth rate by 100 yields the growth percentage.

Population growth is a change in population size during a particular time period. In the simplest calculation, growth rate is equal to [P(t2) - P(t1)]/P(t1), where P(t1) is a past population value and P(t2) is the present population. This calculation yields a growth rate for any chosen time range. It is common to express growth rate as a percentage by multiplying the rate by 100. Dividing the percent population growth by the number of years between t1 and t2 gives an annual growth percentage. For example, a population that experiences 10 percent growth in 10 years has a 1 percent annual growth rate.

The population growth calculation is also an excellent tool for predicting future populations, given a known growth rate. In this case P(t2) is a future population, and the unknown variable, and P(t1) is the present population.

Another method of predicting a future population is to find doubling time. Doubling time is the result of dividing 70 by the percent growth. In this calculation 70 is a constant that derives from the natural log of 2.

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Q:
## How do I calculate sales growth?

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Full Answer >**To calculate percent sales growth over a period, subtract the previous sales figure from the current sales figure, divide the result by the previous sales figure, and then multiply this number by 100, explains Michael Marz for the Houston Chronicle.**In order to obtain the most accurate growth percentage, be sure to use net sales figures. Calculate net sales by taking the total gross sales and subtracting discounts, refunds and any other expenses.Filed Under: -
Q:
## What is exponential growth?

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Full Answer >**The Business Dictionary defines exponential growth as an increase in number or size at a constantly increasing rate.**Math Planet explains that exponential growth is represented by an exponential function, which is a nonlinear function with the form, y = ab^x, where a does not equal zero and b is greater than zero. The graph of any exponential growth function rises from left to right in a curved line.Filed Under: -
Q:
## What are the conditions for the Hardy Weinberg model?

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Full Answer >**According to the Hardy-Weinberg model, evolution will not occur if the following conditions are met: mutation is not occurring, natural selection is not occurring, the population is infinitely large, all members of population breed, all mating is totally random, everyone produces the same number of offspring, and there is no migration in or out of population.**In the real world, some of the conditions can never be met.Filed Under: -
Q:
## What are the advantages of overpopulation?

A:One advantage of overpopulation is that as population grows, so does the information economy. Another advantage is that overpopulation also creates more urbanization, which translates to economic development.

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