A country has population 1400 million, of whom 70% own mobile phones. Among phone owners, 294 million access the Internet; half of those buy goods from e-commerce portals. What percentage of the country are these buyers?
The number of buyers is half the specified 294 million Internet users, or 147 million. Relative to the whole population, $100(147/1400)=10.50\%$, A. The 70% figure describes phone ownership but should not be multiplied again into a count already given for Internet users.
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