There is something wrong with the vendor's weighing. The combined weight of eggs and baskets is 10.55kg, but there is no basket weight 10kg, that is, the basket weighs 0.55kg. But in fact, the basket weighs 0.55kg, that is, the actual weight is only 0.5kg. After conversion, it is 10 kg, which is only about 9 kg, so the stall owner is still short of 1.