Buying a fund makes up its position when the fund falls, and reduces its position cost by constantly buying and increasing its share in the falling process. In the rising process, investors can sell part of it and spread the profit of the sale evenly to the remaining positions, thus reducing the position cost.

For example, when the net value of the fund is 1 yuan, Xiao Li bought a fund 1 000. Now the net value of the fund has risen to 1.5 yuan, and the fund account shows a profit of 500 yuan. Xiao Li intends to sell 500 copies when the net fund value is 1.5 yuan, so Xiao Li's cost will also change accordingly. Regardless of the formalities, Xiao Li's post cost =