Question: In a certain city, only two newspapers A and B are published. It is known that 25% of the city population reads A and

In a certain city, only two newspapers A and B are published.

In a certain city, only two newspapers A and B are published. It is known that 25% of the city population reads A and 20% reads B, while 8% reads A and B. It is also known that 30% of those who read A but not B, look into advertise- ments and 40% of those who read B but not A, look into advertisements while 50% of those who read both A and B, look into advertisements. What per cent of the population read on advertisement?

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