A week's return is to convert the fund's recent ups and downs into interest rates, which is a week's return, and the return in March is the same. Southern Steady earned 4.99 yuan from 100 yuan this week and 2.78 yuan in three months. The accumulated net value of the unit is the sum of the net value of the fund unit and the accumulated dividend amount of the unit after the establishment of the fund, which reflects all the income since the establishment of the fund. Cumulative net value of fund unit = net value of fund unit+cumulative dividend amount of unit in the history of fund (sum of all dividend amounts in the history of fund/total share of fund).