Hello, the principal = 50,000 yuan, the daily income = 9 yuan, the daily interest = 9/50000 = 0.00018, which is 1.8 ten thousandths. Your question is not very clear about the daily interest, so I will help you calculate it separately.

If the daily income cannot continue to generate income, it will be calculated as simple interest. If the daily income can continue to generate income, it will be calculated as compound interest. The annual interest rate of simple interest = 50000*0.00018*365= 3285 yuan. The annual interest rate = 3285/50000= 6.57%

The annual interest rate of compound interest = 50000*(1+0.00018) raised to the 365th power = 3395 yuan. The annual interest rate = 3395/50000 = 6.79%. The above calculations are based on the situation where the daily income is fixed. If the daily income changes, the annual interest and rate of return will

Changes will occur accordingly.

For example, Yu'E Bao calculates interest based on daily compound interest, but the daily rate of return changes.

hope this helps.