Credit card borrowing 400 1 year interest, 720 yuan. According to the relevant public information inquired, the interest is calculated according to five ten thousandths of the daily interest, that is, 4,000 yuan times 0.0005 times 30 days =60 yuan, one year 12 months, and 12 times 60 equals 720 yuan. The interest rate of credit card overdraft will generate interest, and all banks will charge a handling fee for withdrawing cash.