you are a jewelry shop owner. one day a customer comes in to buy a $70 ring. He only has a voucher worth $100. you do not have any cash around, so you go next door to the pastry shop and ask the owner to change the $100 voucher for cash. the pastry shop owner gives you the cash. you go back to your shop and give the customer $30 in change along with the ring. 10 minutes later, the pastry shop owner comes in angry and tells you that the voucher is fake, and that he wants his $100 back. you apologize and give him the $100. question: What is your total loss? (the ring indeed is $70) many have answered this wrong. please think it through.