When investors buy funds, they can calculate their income according to their ups and downs. When the fund is positive, investors gain, and when the fund is negative, investors lose. The fluctuation range of this fund = (current fund price-benchmark price)/benchmark price × 100%. If the investor buys the floor fund, the fluctuation of the fund on that day = (closing price-opening price)/opening price ×100%; If investors buy OTC funds, the price increase or decrease on that day = (net value announced that night-net value announced the day before)/net value announced the day before × 100%. For example, if an investor buys 1 0,000 shares of an OTC fund, and the net value announced on the evening of 1 yuan on the 9th and 1. 1 yuan on the evening of 20th, the increase or decrease of the fund on the 20th is = (/kloc-0. Then, the return of investors on the 20th =1000×/kloc-0 /×10% =100 yuan.