(1) The interest rate conversion formula for RMB business is as follows

1, daily interest rate (0/000)= annual interest rate (%)÷360= monthly interest rate (%) ÷ 30

2. Monthly interest rate (%) = annual interest rate (%)÷ 12.

(two) banks can use the product interest method and the transaction interest method to calculate interest:

1. Accumulate the account balance daily according to the actual number of days, and multiply the accumulated product by the daily interest rate to calculate the interest. The interest-bearing formula is:

Interest = cumulative interest-bearing product × daily interest rate, where cumulative interest-bearing product = total daily balance.

2. Transaction-by-transaction interest calculation method calculates interest one by one according to the preset interest calculation formula: interest = principal × interest rate × loan term, with three details:

If the interest-bearing period is a whole year (month), the interest-bearing formula is:

① Interest = principal × year (month )× year (month) interest rate

If the interest-bearing period is a whole year (month) and days, the interest-bearing formula is:

② Interest = principal × year (month) × year (month) interest rate principal × odd days × daily interest rate.

At the same time, banks can choose to convert all interest-bearing periods into actual days to calculate interest, that is, 365 days per year (366 days in leap years), and each month is the actual number of days in the Gregorian calendar of the current month. The interest-bearing formula is as follows:

③ Interest = principal × actual days × daily interest rate

These three formulas are essentially the same, but because the interest rate conversion is only 360 days a year. However, when calculating the actual daily interest rate, it will be calculated according to 365 days a year, and the result will be slightly biased.

Extended data

The decisive factors of bank loan interest are:

1, bank cost. Any economic activity needs cost-benefit comparison. There are two types of bank costs: borrowing costs-prepaid interest on borrowed funds; Additional cost-the cost of normal business.

2. Average profit rate. Interest is the subdivision of profit, which must be less than the profit rate, and the average profit rate is the highest limit of interest.

3. Supply and demand of loan funds. If the supply exceeds the demand, the loan interest rate will inevitably fall, and vice versa. In addition, the loan interest rate must also consider price changes, securities returns, political factors and so on.

However, some scholars believe that the upper limit of interest rate should be the marginal rate of return of funds. The factor that restricts the interest rate is regarded as the comparison between the profit growth rate of enterprises after borrowing bank loans and the loan interest rate. As long as the former is not lower than the latter, it is possible for enterprises to borrow money from banks.

1, compound interest: compound interest means adding interest at a certain interest rate. According to the regulations of the central bank, if the borrower fails to repay the interest at the time agreed in the contract, it will be charged with compound interest.

2. Penalty interest: If the lender fails to repay the bank loan within the prescribed time limit, the penalty interest paid by the bank to the non-defaulting party according to the contract signed with the parties is called bank penalty interest.

3. loans overdue liquidated damages: the nature is the same as penalty interest, and it is a punitive measure for the defaulting party.