The interest on a 50,000 yuan credit card is calculated at five ten thousandths of a day. According to relevant information, the interest of 50,000 credit cards is calculated at five ten thousandths of a day, depending on daily use and repayment. Interest is the use fee of money in a certain period of time, and it refers to the reward that money holders (creditors) get from borrowers (debtors) for lending money or monetary capital.