The solution to your problem is as follows:
Given:
P₀ = 5,642×10^6 people,
i = 1.3% = 0.013 per year,
n = 2020 - 1994 = 26 years,
We get:
Pn = P₀ e^(i.n)
. . .= 5,642×10^6×e^(0.013×26)
. . .= 7,911×10^6 people
Therefore, the the world's predicted population in the year 2020 is 7,911×10^6 people.
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