The amount of the fund you hold * the net value of the redemption day (note that it was the same day, not yesterday) = the redemption amount.

Redemption Amount-Redemption Amount * Redemption Rate (i.e. Redemption Fee) = Net Redemption Amount (i.e. the money you actually got when redeeming).

Net redemption-investment amount (that is, the money you spent when you bought the fund) = income.

Of course, this income may be positive (making money) or negative (losing money).

Fund amount you hold = investment amount *( 1- subscription rate)/net value of the day.

Please note that the net value of the day is not known at the time of purchase or redemption, because it can only be found on the fund company's website around 8 pm that day. This is a special reminder.