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ANSWER:

a.

 

Initial population=a= 1 282 693 000

Growth factor =b= 1+1.51%=1.0151

t=?

 

 

b. 
It takes about 30 years from 2015 for the population to reach 2 000 000 000.

 

 

Steps:

∴It takes about 30 years for the population to reach 2, 000, 000, 000.

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