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In Ranchi, only two newspapers The Hindustan and The Indian Express are published. It is known that 25% of the city population reads The Hindustan and 20% reads The Indian Express, while 8% read both newspapers. It is also known that 30% of those who read The Hindustan but not The Indian Express look into advertisements while 50% of those who read both The Hindustan and The Indian Express look into advertisement. What percentage of the population reads an advertisement?