re: Help with riddle - How Much Money Did The Store Lose?

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Riddle:
A man steals a $100 bill from a store’s cash register. Then he buys $70 worth of goods at the store using the $100 he stole and he gets $30 in change back. How much money did the store lose?

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We'd have to know the store's profit margin/markup on the clothes he bought with the stolen money in order to deduce the store's losses. The reason being that the store regained some of the stolen money in profit from the sale.