Ans this Q :-

A consumer purchased few toys from a supermarket for RS. 35, he gave 100 Rs. currency to the salesperson but the salesperson had no loose change

…so he collected loose change from the next shop and pay off the balance amount Rs 65 to the consumer.After few hours the owner of next shop comes to the supermarket and says the Rs 100 the sales man gave to him was a duplicate currency and he want to change the currency.

….sales man got no option but to change the duplicate currency

…In this transaction find the loss of supermarket and explain how????????? ?????