The closing surplus (20 lots sold) on that day is: (2050-2000)-20-10 =10000.

The position surplus of the day is: (20 reserved hands) (2040-2000)-20- 10 = 8000.

The total surplus of that day is: 10000+8000= 18000.

The total account on that day was 65438+ million+18000 =118000.

May 2nd

A total of 28 lots were held.

The margin occupation is 2060 ~ 28 * 10 ~ 5% = 28840.

Available balance is 1 18000-28840=. . . .

That's what happened.