The annual increase of the fund is equal to the annualized rate of return. The annualized rate of return of the fund = (income/principal)/(investment days /365 days) * 100%. The annualized rate of return of the fund refers to the annualized rate of return converted from the rate of return obtained during the duration of the fund. According to the above formula, the number of investment days in a year is 365 days, so the annual increase of the fund is equal to the annualized rate of return.

The annualized rate of return is only calculated by converting the current rate of return into the annual rate of return, which is a theoretical rate of return, not a truly realized rate of return.