My friend said he is a short-term stock god, I don't believe it.

I threw him 5000 yuan: within a week, no matter what method, turn it into 10,000 for me.

He was silent for three seconds, took the money and went downstairs.

Five minutes later he came back, handed me a card: done, ten thousand.

I was shocked: how did you do it?

He calmly said: the foot massage shop downstairs, charge 5000 get 5000.