A magazine seller has 500 subscribers and collects annual subscription charges of Rs.300 per
subscriber. She proposes to increase the annual subscription charges and it is believed that for
every increase of Re 1, one subscriber will discontinue. What increase will bring maximum
income to her? Make appropriate assumptions in order to apply derivatives to reach the
solution. Write one important role of magazines in our lives.
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https://www.meritnation.com/ask-answer/question/atelephone-company-in-a-town-has-500-subscribers-on-its-list/application-of-derivatives/5787022
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