12 yuan x 1000 shares-12 yuan x 1000 shares x commission (in thousands)-12 yuan x 1000 shares x0.00 1 (stamp duty).

9 yuan x 1000 shares +9 yuan x 1000 shares x commission (several thousandths)+1000 shares x0.00 1 (transfer fees), this is the capital you invested.

The commission of each securities company is different, and the stamp duty is the same as that of transfer fees.

The money calculated in front MINUS the money behind is your income, that is, the money you earn!