According to the benchmark interest rate of the central bank, the annual interest rate of commercial loans over five years is 4.90%; The annual interest rate of provident fund loans for more than five years is 3.25%, and the 20-year interest of 400,000 mortgages can be calculated as follows: commercial loans 1, and 400,000 mortgages are 228,266.29 yuan by equal principal and interest repayment method.

2. The 20-year interest of 400,000 yuan mortgage with average repayment method is 1968 16.67 yuan.

2. Provident fund loan 1, repayment method of equal principal and interest. 20-year interest on 400,000 mortgage144,507.93 yuan. 2. Average capital repayment method: 20-year interest of 400,000 yuan mortgage 13054 1.67 yuan.

Interest refers to the reward obtained by the fund owner from lending the fund, which comes from part of the profits formed by the producers using the fund to play their business functions. Interest is one of the manifestations of the time value of funds. From its formal point of view, it is the reward that the monetary owner gets from the borrower for issuing monetary funds.

Abstract interest point refers to the value-added amount brought by monetary funds injected into the real economy and returned. Generally speaking, interest refers to the remuneration paid by the borrower (debtor) to the lender (creditor) for using the borrowed currency or capital. Also known as the symmetry of sub-fund and parent fund (principal). The calculation formula of interest is: interest = principal x interest rate x deposit term.