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A census showed that from 1990 to​ 2000, a​ country's population increased by 25.325.3​%. The country reported its population in 2000 to be 15 comma 922 comma 54315,922,543. What was the​ country's population in​ 1990?

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 Feb 22, 2020
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Let  x  represent the county's population in 1990.

In the year 2000, the county's population was 15,922,543.

This represents an increase of  25.325.3%.

 

To find the original population: 

  add the original population to the increase in population to get the final population

  -  the original population  =  x

  -  the increase in population is  25.325.3% · x   =  0.253253 · x

  -  the final population is 15,922,543

 

                                                  x  +  0.253253·x  =  15,922.543

                                                          1.253253·x  =  15,922.543

                                                                          x  =  15,922.543 / 1.253253

                                                                          x  =  12,704,971

 Feb 22, 2020

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