2. The fund in your chart should be 3114.73-30.01= 3084.72, with a daily increase of 0.97%, with only two decimal places reserved for the daily increase and four decimal places reserved for the fund position cost. If only two decimal places are retained, the daily increase may be slightly different.

3. There is a certain difference between the expected increase and the actual increase. The estimated increase of the fund I met is as small as the actual increase, so the calculation of income depends on the actual increase every day.

4. If there are decimal differences, the mantissa will be slightly different. If 3084.72 * 0.9728% = 30.00 1 is about 30.0 1, of course, the actual increase is estimated to be rounded off, so this mantissa difference is caused.