The wife of a poor family used to make bread, and her husband would take it to a nearby grocery store and sell it. Bread weighed one kilogram and was a good buy, so it helped the family a lot. But once, the owner of the shop, doubting the honesty of the bread seller, weighed all the bread that was brought, and all the bread weighed 900 grammes. He was very angry and decided not to sell her bread again. The next morning, the baker's husband came with the bread. The owner of the shop expressed his anger at him and said, "You are a liar and a fake person." Don't bring me your bread again. I won't take anything from you. You told me that all the loaves weigh 1 kilogram, but in reality they all weigh 900 grams. You won't be cheated," said the screamer. The poor man stopped awkwardly and looked down, "Sir, we don't really have scales, instead of scales we use 1 kilogram of sugar bought from you." "Because the weight of sugar and bread are the same, we give you one kilogram."