What Tian Hong Fund deducts is not interest, but transaction costs. This may be because you set up a fixed investment fund. If you set a fixed investment and it is a daily investment, then he will deduct money every day. For general funds, don't choose daily fixed investment, it's better to choose weekly fixed investment and monthly fixed investment, because if you vote daily, there is a handling fee, which is not cost-effective. You might as well set a slightly longer period for the fluctuation range to be meaningful. If you invest daily, you might as well buy more at one time and then make a small difference, which is more cost-effective. Such income is more cost-effective.