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In Ranchi, only two newspapers Dainik Jagran and Prabhat Khabar are published. It is known that 25% of the city population reads Dainik Jagran and 20% reads Prabhat Khabar while 8% reads both Dainik Jagran and Prabhat Khabar. It is also known that 30% of those who readDainik Jagran but not Prabhat Khabar look into advertisement and 40% of those who read Prabhat Khabar but not Dainik Jagran look into advertisements while 50% of those who read both Dainik Jagran and Prabhat Khabar look into advertisements. What is the percentage of the population who read an advertisement?