If the 4,000 fund loses 15 points, if you add 10,000, it will lose 10 points.

After the net value of the fund falls, it needs to rise even more to return to its original position. The formula for calculating return on capital is: return on capital = 1/(1-loss)-1, that is, when the investor loses 15%

, the recovery rate of the increase = 1/(1-15%)-1=17.65%. Therefore, when the fund purchased by an investor loses 15%, it needs to increase by 17.65% to remain flat.