500*(f/a， 10%，5)*( 1+ 10%)=3357.8

As the basic calculation method of bank deposit interest and loan interest. The interest calculation formula has played a great role in the daily settlement of banks and the daily life of ordinary people, and it will become more and more important.

computing formula

The interest rate of savings deposits shall be stipulated by the state and promulgated by the People's Bank of China. Interest rate, also known as interest rate, is the ratio of interest to principal in a certain date, which is generally divided into annual interest rate, monthly interest rate and daily interest rate. The annual interest rate is expressed as a percentage, the monthly interest rate is expressed as one thousandth and the daily interest rate is expressed as one thousandth. If the annual interest rate of 9% is written as 9%, that is to say, every thousand yuan deposit will get the regular annual interest rate in 90 yuan, and the monthly interest rate of 6% is written as 6‰, that is, the monthly interest rate of every thousand yuan deposit is written as 6 yuan, and the daily interest rate of 1% 5 cents is written as 0. 15‰, that is, the daily interest rate of every thousand yuan deposit is 1.5 cents. Monthly interest rate ÷30= daily interest rate; Annual interest rate ÷360= daily interest rate.

Classification situation

The interest calculation formula is mainly divided into the following four situations.

First, the basic formula for calculating interest. The basic formula for calculating the interest of savings deposits is: interest = principal × deposit period × interest rate;

The second is the conversion of interest rate, in which the conversion relationship among annual interest rate, monthly interest rate and daily interest rate is: annual interest rate = monthly interest rate × 12 (month) = daily interest rate ×360 (day); Monthly interest rate = annual interest rate ÷ 12 (month) = daily interest rate ×30 (days); Daily interest rate = annual interest rate ÷360 (days) = monthly interest rate ÷30 (days). In addition, the use of interest rates should be consistent with the deposit term;

Third, the starting point of the interest calculation formula,

1, the starting point of savings deposit interest is RMB, and interest is not paid for cents below RMB;

2. The interest amount shall be calculated to one decimal place and rounded to one decimal place when actually paid;

3. All savings deposits, regardless of the deposit period, are paid with the principal at the time of withdrawal, excluding compound interest, except that the current savings are settled annually and the interest can be converted into the principal;

Fourthly, the calculation of deposit period in the interest calculation formula,

1, and the storage period is calculated by counting the first number and the last number;

2, regardless of the big month, small month, flat month, leap month, every month is calculated as 30 days, and the whole year is calculated as 360 days.

3. The maturity date of all kinds of deposits shall be calculated on an annual and monthly basis. If the account opening date is the missing date of the expiration month, the expiration date should be the last day of the expiration month.