Smartphones sold per year in a country (segmented, with replacement and first-time buyers)
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The prompt
Estimate how many new smartphones are sold per year in a middle-income country of 100,000,000 people.
Assume the population splits into about 18 million children under 12 (not counted as buyers), 70 million people aged 12 to 59, and 12 million aged 60 and over.
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