First of all, if you have a friend who buys something, you can swipe your card and ask him to give you cash. You can set up some cash repayment by credit card for him, but it is best to swipe your card after the checkout date, so that you can have an interest-free repayment day of 45 days, which is enough for your turnover. Second, you can see how much you can repay now, preferably how much you can repay, and calculate the daily interest on the rest according to the day you swipe your card. If you can't repay any money, then the daily interest rate of five ten thousandths (which must start from the day you swipe your card, not from the day you check out) is 4500 * 0.0005 = 2.25. If the same fee is calculated in installments, you can borrow in full for 48 days, which is enough for you to last until next month. Moreover, as much money as you have in the middle, the daily interest will be reduced. How to calculate is based on the minimum repayment amount. Pay back the principal and interest if you have money during the period. Besides, there is another problem. If your checkout date is, for example, the 20th, then the latest repayment date should be the 8th of next month, which means it is delayed by 18 days. If you swipe your card before the closing date of this month, your latest repayment date will be.