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Two newspapers A and B are published in a city. It is known that 25 % of the city population reads A and 20% reads B while 8% reads both A and B. Further, 30% of those who read A but not B look into advertisements and 40% of those who read B but not A also look into advertisements, while 50% of those who read both A and B look into advertisements. Then the percentage of the population who look into advertisements is :

1. 13.9
2. 13.5
3. 12.8
4. 13

Correct answer: 13.9

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