At first glance, this problem looks like this, but in fact, if it is calculated by 490+490+ 10, it is a concept of stealing. What did you do with the money you borrowed from your parents? Did you buy shoes? Then the sum of the money for shoes and the money in your hand is 1000. If you give the remaining 30 points back to your parents, it means that you owe your parents 490, which is 980. This 980 comes to 10 yuan and your shoes. But in fact, if it is 490+490+ 10, it is the concept of stealing. Think of it this way. What did you do with the money you borrowed from your parents? Did you buy shoes? Then the sum of the money for shoes and the money in your hand is 1000. If you give the remaining 30 points back to your parents, it means that you owe your parents 490, which is 980. This 980 adds up to 65438+ in your hand. So there is no difference between 10 yuan.