The conclusion is: the interest calculation of Ping An Bank credit card depends on the repayment situation. The following is an analysis of costs under different repayment situations:

1. If Xiao Ming repays 10,000 yuan in full on April 25, the repayment date, no interest charges and late payment fees will be incurred.

2. If the repayment is 9,000 yuan, which exceeds the minimum repayment amount by 1,000 yuan, although no late payment fees will be incurred, interest will accrue on the portion that is not repaid in full, totaling 132.5 yuan. Interest will be included in the May bill and will be accrued in full from the date of consumption.

3. If you repay 500 yuan, in addition to the late payment fee of 25 yuan, you also need to pay overdraft interest of 153.75 yuan. The total of the two will be reflected in the next bill.

4. Assuming no consumption after April 25, the May bill will include interest on the remaining principal of 1,000 yuan, totaling 157.40 yuan, of which the interest is calculated on a monthly compound basis.

In addition, if you borrow 10,000 yuan, regardless of intermediate repayments, the annual interest rate will reach 19.56% after one year based on the 0.5% daily interest rate and monthly compound interest in the credit card regulations. Please note the interest accrual rules. The overdue portion will accumulate compound interest on a monthly basis, affecting the final total repayment.