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The profit earned on selling a book for ₹450 is the same as the loss incurred on selling it for ₹390. Find the cost price of the book.
The profit earned on selling a book for ₹450 is the same as the loss incurred on selling it for ₹390.
$$selling\ price_1 - cost\ price = cost\ price - selling\ price_2$$
$$450-cost\ price = cost\ price-390$$
$$450+390 = cost\ price + cost\ price$$
$$2 \times cost\ price = 840$$
$$cost\ price = 420$$
So the Cost price of the book = ₹420
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