Question about Texas Instruments TI-30XA Calculator

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Calculate future population

How do you use this calculator to calculate future population?

6000000000 at a growth of 1.01 over the next 24 years

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Re: calculate future population

The formula for population growth is:
population * (annual growth rate ^ number of years)

In your example,
6000000000 * (1.01^24) = 7618407891

To get your calculator to perfom the calculation, enter it in the following steps:
Type 6000000000
Press the multiply key
Press the ( key
Type 1.01
Press the yx key (located right above the divide key)
Type 24
Press the ) key
Press the = key

You can reuse this formula, substituting any values you wish for the current population, growth rate, and number of years.


Posted on Nov 12, 2007

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Re: calculate future population

Solve the equation of regression line for two varaible and three varialbles

Posted on Apr 19, 2011

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Re: calculate future population

To calculate the future population the correct formula is Current Population x Total Fertility Rate / 2 x Future Life Expectancy / Current Life Expectancy or CP*TFR/2*FLE/CLE

Look up The World Bank and CIA Factbook for further info.

Posted on Jul 29, 2009

Re: calculate future population

I don't think this is either A) the correcto formula or B) the correct way to solve it. So i really think this should be in the unsolved problem catergory. in 24 years the earth's population on its current trend of 1.01 would have it way higher than 7.6 billion.

Posted on Jan 23, 2008

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Hi there, if you are following the example from page 24 of the manual - The steps are as follows - reset or clear the previous values by pressing the orange key (2nd F) and MODE.
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Growth rate between two periods population in 2000 is 206,000 and population in 2010 is 240,000. how to use calulator to get the growth rate used

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The initial population of a town is 2800, and it grows with a doubling time of 10 years. Whay wi the population be in 12 years

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The tenth root of two is about 1.0718 . That value raised to the twelfth power is about 2.2974 . Multiplied by the initial population of 2800 gives 6433.

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your best bet in any kind of exponential equation is to set up the general form of the equation and then solve for the constants with the numbers they gave you. With P being population, t being time, you know it is going to look like P=Ae^(b*t) and you are given 2 P's for 2 t's.

So for the first set :

Eq 1 P(26)=40,000=Ae^(b*26)

and the second being a time t=0 P was half the current value:

Eq 2 P(0)=20,000=Ae^(b*0)
20,000=A*1 so A=20,000

now b from Eq 1


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