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If the world’s population is increasing at an annual rate of 1.3%, and there were 5 billion people in the year 1986, then in what year will the world’s population be 10 billion?

Answer :

HomertheGenius
5 billion * ( 1 + 0.013 ) ^x = 10 billion
1.013 ^x = 10 : 5 = 2
[tex]x = log_{1.013}2 [/tex]
x = 54
1986 + 54 = 2040
In the year 2040 the world`s population will be 10 billion. 
 

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