Because the interest rate is what interest rate, time is calculated by the day.

1 year =365 days

One-year interest:

10000× 4× 365 =1460 (yuan)

For example:

Ten thousand yuan, with daily interest rate of 0.045% and one month's interest: 135.

Daily interest = principal * daily interest rate;

10000*0.045%=4.5 yuan;

Monthly interest = daily interest * 30;

4.5*30= 135 yuan.

Extended data:

Conversion formula of daily interest rate, annual interest rate and monthly interest rate:

Daily interest rate (0/000)= annual interest rate (0/0) ÷ 360;

Monthly interest rate (0/00)= annual interest rate (0/0)÷ 12.

Monthly interest rate = daily interest rate ×30

Annual interest rate = monthly interest rate × 12

Interest = interest product × daily interest rate

Baidu encyclopedia-daily interest rate