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Question

A bookseller sells novels at Rs. 200 per copy up to 50 copies. For every 5 extra copies bought, the bookseller reduces the price by Rs. 10 per book for the entire set. If the number of novels sold is always a multiple of 5, then how many novels should the bookseller sell to maximize revenue?

A 55

B 75

C 85

D 100

E None of these

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