The ratio of interest to principal equals the interest rate. Annual interest rate = monthly interest rate × 12 (month) = daily interest rate ×360 (days); The so-called interest rate is the abbreviation of "interest rate", which refers to the ratio of interest amount to deposit principal or loan principal in a certain period of time. Usually divided into annual interest rate, monthly interest rate and daily interest rate.

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Interest rate refers to the ratio of the amount of interest to the amount of borrowed funds (principal) in a certain period. Interest rate is the main factor that determines the capital cost of enterprises, and it is also the decisive factor for enterprises to raise funds and invest. To study the financial environment, we must pay attention to the current situation and changing trend of interest rates.

Interest rate refers to the ratio of the interest amount due in each period to the par value of the borrowed, deposited or borrowed amount (called the total principal). The total interest of the lent or borrowed amount depends on the total principal, interest rate, compound interest frequency and the length of time of lending, deposit or borrowing. Interest rate is the price that the borrower needs to pay for the money borrowed, and it is also the return that the lender gets by delaying his own consumption and lending it to the borrower. The interest rate is usually calculated by the percentage of one-year interest to the principal.