In this way, suppose you buy 1000 yuan, * * 16780 yuan, sell 500 shares at 18.32 the next day, and earn 18.32*500=9 160 yuan. This is equivalent to your total investment in the stock market of 16780-9 160=7620 yuan, and you own 500 shares, so the cost is 7620/500 shares = 15.24 yuan. The computer shows that the extra part of 15.28 is of course the handling fee. .....

The second question: the calculation cost is the total invested capital/the number of shares owned, that is, the total invested capital =7620+2000* 18, the number of shares =2000+500, and the cost = self-calculation!