Annual deposit 10000 yuan, deposit 10 years, annual interest rate of 3.50%, automatic transfer, compound interest.

The sum of principal and interest after 10 years is:10000 * (1+3.50%)10+00000 * (1+3.50%) 9+65438+. ( 1+3.50%)^7+ 10000*( 1+3.50%)^6+ 10000*( 1+3.50%)^5+ 10000*( 1+3.50%)^4+ 10000*( 1 +3.50%)^3+ 10000* ( 1+3.50%) 2+ 10000 * ( 1+3.50%) = 12 14 19.95438+092 = 1238.

In which the principal is 654.38 million yuan and the interest is 2 1465.438+09.92 yuan.

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. Except for current savings, which are settled on an annual basis and interest can be converted into principal, all other savings deposits, regardless of the duration, are paid with the principal at the time of withdrawal, excluding compound interest;

Fourth, the calculation of the deposit period in the interest calculation formula.

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

2. Every month is counted as 30 days, regardless of big month, small month, flat month and leap month, and every year is counted as 360 days. 3. The maturity date of all kinds of deposits shall be calculated annually and monthly. If the account opening date is the missing date of the due month, the last day of the due month is the due date.