21 million.

The purchase price of 51,111 tons of scrap steel in the twelfth episode is 735 yuan per ton. After the price of steel has doubled, it can be sold to 1,511 yuan per ton. After deducting profits, deposits and shares, she earned at least 21 million.

Xu Banxia is a fictional character in the TV series The Wind Blows Pinellia, which is adapted from Anai's novel Don't Die, and is played by Zhao Liying.