Monthly yield-the ratio of the change of unit net value on the first trading day and the last trading day of each natural month to the unit net value on the first trading day.

Formula: (net unit value on the last trading day of the month-net unit value on the first trading day of the month)/net unit value on the first trading day of the month = monthly rate of return.

30-day yield-the ratio of the change value of unit net value in the 29th trading day today and before to the unit net value in the 29th trading day before.

Formula: (net unit value today-net unit value on the 29th trading day before)/net unit value on the 29th trading day before = 30-day yield.