A bookstore owner earns 15% profit by selling a book for Rs. 230 and a 25% profit by selling a magazine for Rs. 250. If he sells the book for Rs. 200, what is the minimum price at which he must sell the magazine to avoid any loss on the entire transaction?
ATQ, Given: Book sold for Rs. 230 at a 15% profit. Magazine sold for Rs. 250 at a 25% profit. Assumption: Let the cost price of the book = Rs.'b' and the cost price of the magazine = Rs.'m' Calculation for book: 
Calculation for magazine: 
If the book is sold for Rs. 200, the loss on the book = Rs. 0 (no profit, no loss). Total cost = 200+200 = 400. To avoid any loss = 200+p= 400 ⇒ p = 200 Therefore, he must sell the magazine for at least Rs.200 to avoid any loss.
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