What is the percentage increase in the number of mobile phones in the country from 2016 to 2019?
Explanation:
The number of users increase by 20% every year.
If the number of users in 2016 were 1000, the number of users in 2019 will be = 1000 × (1.2)3 = 1728
∴ % Increase = 7281000 × 100 = 72.8%
Hence, option (b).
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