Obviously, the following table lists these problems.
It turns out that 100 yuan is owed to his father 50 yuan and his mother 50 yuan.
Flowers to 97 yuan
The rest of 3 yuan returned 1 yuan (* * returned to 2 yuan), owing to father 49 and mother 49 1 yuan. Note that the sum of the remaining one yuan and the two yuan returned by * * * is the total amount of money borrowed by * *. There is no disappearance of 1 element, but a conceptual error.
If we have to investigate where this dollar went, we can refer to the explanation that each parent spent 48.5 yuan, which is upstairs, but first of all, it is a conceptual confusion.