Open interest rate means that you can repay all the principal of the loan at any time, while closed interest rate only allows you to pay the amount stipulated in the contract regularly, otherwise you will be charged management fees or fines. In the past, only the concept of closed interest rate was allowed, and it must be paid on schedule. Now, the concept of closed interest rate has been expanded. You can choose to double the payment or pay more every year 10%- 15%. Obviously, the extension concept of closed interest rate is not different from that of open interest rate. "/zd/ym "