A man steals a $100 bill from a store's register. He then buys $70 worth of items using that stolen $100 bill. He receives $30 in change. How much money did the store lose?
The store lost $100. The man stole a $100 bill from the store, so the store lost the full amount. The man then spent $70 on items from the store, but the money he used to purchase those items was the stolen $100 bill, so the store still lost the full amount. The man received $30 in change, but that change still came from the store's money and not from the man's own money, so the store still lost the full $100.