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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