If you spend 5,000 yuan on a credit card and pay it back to 500 yuan every month according to the minimum repayment amount, you will have to charge interest, which is 5/5 per day.

Monthly interest =5000*0.0005*30=75 yuan.

Minimum repayment amount is a way of credit card repayment. Minimum repayment amount, calculation method of minimum repayment amount: minimum repayment amount = unpaid part of the minimum repayment amount of the previous bill+overdraft balance of the current bill * 10%. If repayment is made according to the minimum repayment amount before the due repayment date (inclusive), the card issuer will charge overdraft interest at the rate of 0.5 ‰ per day.

There are two ways to repay credit cards:

1. Full repayment means full repayment before the repayment date, and the overdraft part is repaid without interest.

2. Repayment by installment. After applying to the bank for installment, monthly repayment = overdraft amount/installment number+installment fee.