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LOST One took a $100 bill from the register without being noticed. After that he collected goods worth $70 and payed with the stolen bill... The cashier - unaware of the theft - gave back the $30 change. How much was actually stolen from the shop?
Skipper: We'll fix it. Alex: Fix it? How you gonna fix this? Skipper: Grit, spit and a whole lotta duct tape.
-100: The person took $100 from the register.
-70: The person purchased $70 goods from the shop.
+100: The person paid $100 to the cashier.
-30: The person received $30 change from the cashier.
If you have an important point to make, don't try to be subtle or clever. Use a pile driver. Hit the point once. Then come back and hit it again. Then hit it a third time - a tremendous whack.