75 yuan. The interest calculation method for a credit card overdraft of 5,000 yuan per month mainly depends on the bank's policy. Normally, credit card interest is calculated on a daily basis. The longer the overdue period, the higher the interest charges will be. Take Industrial Bank as an example. Interest on Industrial Bank's credit card debt is charged at 50,000 per day. A credit card debt of 5,000 yuan is calculated based on 30 days a month, and the interest is equal to 5,000 times five ten thousandths multiplied by 30, which is 75 yuan. We solemnly state that the above answers are for reference only.