Fund income = principal * rate of return. For example, if the fund income is 50% and the fund principal is 1 1,000 yuan, then the fund income can be calculated as: 1 1,000 * 50% = 500 yuan. The fund income does not need to be calculated manually by investors, and will be directly displayed in investors' positions.

Fund income is determined by the investment target. For example, stock funds mainly invest in a basket of stocks, so the rise and fall of the fund is determined by this basket of stocks. Invested stocks go up, funds go up, investors gain, invested stocks go down, funds go down, and investors suffer losses.