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A telephone company in a town has 500 subscribers on its list and collects fixed charges of Rs 300 per subscriber.The company proposes to increase the annual subscription and it is believed that every increase of Rs 1one subscriber will discontinue the service.Find what increase will bring maximum revenue?

In a colony of 170 members 70 subscribe Deccan Chronicle and 120 subscribe Times of India. How many subscribe only Deccan Chronicle? (Each subscribes at least one.)

Comprehension: Study the following information carefully and answer the question given below it: In a certain town, there are 5000 people. Out of them, 1200 do not subscribe for any newspaper, 2700 subscribe to "The Indian Express' and 1800 subscribe to "The Hindu'. How many subscribe to 'The Indian Express' only?