The calculation formula of interest is: interest = principal x interest rate x deposit term X( 1- interest tax).

So the interest after one year is 2.6* 10? *4%*( 1-5%)

That is, the sum of principal and interest is: 2.6* 10? + 2.6* 10? *4%*( 1-5%)

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The formula of the above situation is as follows:

Interest = principal × annual interest rate (percentage) × deposit time

If the interest tax is X (1-5%)

Total principal and interest = principal+interest