Fixed monthly investment of 1 ,000 yuan means that you have bought a fund of 1 ,000 yuan per month. Because the net value of the fund on the day of fixed investment every month is different, the share of 1 0,000 yuan is also different. The fund share in your hand is the sum of your previous monthly fixed investment shares, so your current income is the sum of your shares multiplied by the current net value. For example, if you invest 1 1,000 yuan on the 5th of each month and the net value of the fund is 2.0 yuan on the 5th of June, then the share you bought on the 5th of June is 500; On February 5, the net value of the fund was 2.5 yuan, so the share bought in February was 400; The net value of the fund in March was 3.0 yuan, so the share bought in March was 333.3; On March 2 1 day, the net value of the fund was 4.0 yuan. At this time, the total share in your hand is 1233.3 points, and the income is the net value multiplied by the share, that is, 4.0 yuan multiplied by 1233.3 equals 4933.2 yuan. The net income is the income minus the fixed investment amount, that is, 4933.2-1000-1000 =1933.2 yuan.