China Merchants Bank supports cardholders to hold multiple credit cards at the same time. However, the amount of all cards (including supplementary cards) under the personal credit card account is the same, and the amount of credit cards will not be accumulated. For example, suppose the credit limit of a personal credit card account is RMB10000, and there are two credit cards under this account. If one card runs out of 8,000 yuan, the available credit limit of another card is 2,000 yuan.