The calculation method of annual interest rate is equal to the product of interest divided by principal and term (year). Because the calculation method of annual interest rate is equal to the product of interest divided by principal and term (year), the annual interest rate is the monthly single machine multiplied by 1.8 times. The annual interest rate refers to the deposit interest rate for one year. 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.