The estimated population of the world was 1.6 billion in 190 and 4.0 billion in 1975. What was the percent increase?
In 1900, there were 1.6bn people,
That means that in 1900 1.6bn was 100%
percent increase is,
There was a 250% increase.
There was a 250% increase because it is
Let it be
We need to build an equation. We know that when we add
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