At first glance, this seems like an easy math problem, and most people are confident they know the answer within seconds. But once they start thinking about it, the puzzle becomes surprisingly confusing. Some people say the store lost $200, others argue for $170 or $130. The real trick is that the brain can accidentally count the same $100 twice.
A man steals a $100 bill from a store register. Later, he returns and uses that same stolen $100 bill to buy $70 worth of products. The cashier gives him $30 in change. So, how much did the store actually lose?
The easiest way to understand it is to look at what the store has at the end. The thief takes $100 from the register, creating a $100 loss. But when he returns and spends that same bill, the $100 goes back into the register. The
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