The percent of them that live without clean drinking water is; 14.5%
We know from scientific notation that;
1 billion = 1 * 10⁹
Now, we are told that there are 6.9 * 10⁹ people in the world. Thus, if almost a billion people on the planet don't have access to clean drinking water, then the percent of them that live without clean drinking water is;
(1 * 10⁹)/(6.9 * 10⁹) * 100%
= 14.5%
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