Question

In the year 2002 the world population estimated at 6 billion people. Based on research from the World Bank, about 20% lives ln less than $1 per day. How many people lived on less than $1 per day??????

Answer 1

6 billion= 6*10^9.

We have an equation: ?/ (6*10^9)= 20/100

Cross multiply:
100*?= 20* 6*10^9
⇒ ?= 20* 6*10^9/100= 1.2*10^9

About 1.2*10^9 people live on less than $1 per day~