People's Education Press sixth grade primary school mathematics volume II unit 2 percentage 1 1 interest rate.

We call the money deposited in the bank the principal, the extra money given by the bank at the time of withdrawal the interest, and the percentage of interest in the principal is the interest rate.

Interest rate:

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.

In modern economy, interest rate, as the price of capital, is not only restricted by many economic and social factors, but also has a great influence on the whole economy.

Therefore, modern economists pay special attention to the relationship between various variables and the balance of the whole economy when studying the decision of interest rate. Interest rate determination theory has also experienced the evolution and development of classical interest rate theory, Keynesian interest rate theory, loanable funds interest rate theory, IS-LM interest rate analysis and contemporary dynamic interest rate model.