The fund calculates profit and loss through net value. If the net value goes up, it means profit, and if the net value goes down, it means loss. The calculation formula of fund income is: principal × rate of return or (current net value-net value at the time of purchase) * position share. For example, if an investor buys a fund with 10000 yuan, and the fund rises by 10% within one month, then the calculation method of income is:10000 *10% =1000 yuan. Or the current net value of the fund is 1. 1 yuan, the net value at the time of subscription is 1 yuan, and the income is: (1.1) *10000 =/kloc.

Investors need to deduct the handling fee when buying funds. If they buy a fund with front-end fees, the system will deduct the subscription fee at one time, and if they buy a fund with back-end fees, they will charge a redemption fee according to the holding time. In addition, there are intermediate expenses such as management fees, custody fees and sales service fees, which need to be deducted when actually calculating the fund profits.