Fund sales expense = total fund sales * redemption rate. For example, if the total fund selling amount is 1000 yuan and the redemption rate is 1.5%, it can be concluded that the fund selling fee is1000 *1.5% =15 yuan.

The fund selling fee varies according to the holding time. The longer the holding time, the lower the charging standard. The fees charged by each fund are different. Investors can inquire about the specific charging standards in the fund trading rules.