Subscription fee = subscription amount × [1-1(1+subscription rate)] (external deduction method)

Interest carry-over during subscription period = subscription amount × interbank deposit rate × (day /365)

Subscription share = (subscription amount-subscription fee+interest carry-over during subscription period)/net fund value

2. Calculation formula of fund subscription share:

Subscription fee = subscription amount × subscription rate

Subscription share = (subscription amount-subscription fee)/unit fund net value

3. Calculation formula of fund redemption funds:

Redemption fee = redemption share × unit fund net value × redemption rate

Actual available funds = redemption share × unit fund net value-redemption fee

4. Discount rate = (unit net share-unit market price)/unit net share.

According to this formula, when the discount rate is greater than 0 (that is, the net value is greater than the market price), it is a discount, and when the discount rate is less than 0 (that is, the net value is less than the market price), it is a premium. In addition to investment objectives and management level, discount rate is an important factor in evaluating closed-end funds.

Due to the limitation of scale and the influence of liquidity, closed-end funds generally have a discount rate. High discount rate is an important factor to trigger investment.

For example, the net value of a closed-end fund on a certain day is 2.23 yuan, and the closing price of that day is 1.76 yuan. Then, the discounted value of the fund is:

2.23- 1.76=0.47 (yuan)

The discount rate is:

(2.23- 1.76)/2.23=2 1.08%

Extended data:

Precautions for purchasing funds:

First, pay attention to arrange the proportion of fund varieties according to their own risk tolerance and investment purpose. Choose the fund that suits you best, and set an investment ceiling when buying partial stock funds.

Second, be careful not to buy the wrong "fund". The popularity of funds has led to some fake and shoddy products "fishing in troubled waters", so we should pay attention to identification.

Third, pay attention to the later maintenance of your account. Although the fund is worry-free, it should not be left unattended. Always pay attention to the new announcements on the fund website, so as to have a more comprehensive and timely understanding of the funds you hold.

Fourth, pay attention to buying funds, and don't care too much about the net value of funds. In fact, the fund's income is only related to the net growth rate. As long as the fund's net growth rate stays ahead, the income will naturally be high.

Fifth, be careful not to "love the new and hate the old" and not blindly pursue new funds. Although the new fund has inherent advantages such as preferential prices, the old fund has long-term operating experience and reasonable positions, which is more worthy of attention and investment.

Sixth, be careful not to buy bonus funds unilaterally. Fund dividend is the return of investors' previous income, so it is more reasonable to change the dividend method to "dividend reinvestment" as far as possible.

Seventh, be careful not to talk about heroes in the short term. It is obviously unscientific to judge the pros and cons of the fund by short-term ups and downs, and it is necessary to make a comprehensive evaluation of the fund in many aspects and conduct a long-term investigation.

Eighth, pay attention to flexible investment strategies such as steady and worry-free fixed investment, affordable and simple dividend transfer.

When choosing a fund, you must measure your risk tolerance clearly, and you can't blindly listen to the propaganda of sales staff. If your risk tolerance is weak, or the funds you want to use in the short term, you can't invest too much in a single stock fund to avoid being greatly affected by the risk of stock market fluctuations.

Therefore, for individual investors, it is more meaningful to have a long-term investment mentality, choose appropriate fund products according to their own risk tolerance and renewal, avoid excessive pursuit of popular funds with outstanding short-term returns, pay more attention to funds with relatively stable long-term performance, and spread risks through fixed investment and portfolio allocation to obtain long-term stable returns.