4500。 The minimum repayment amount of a credit card is generally 10% of the arrears. The calculation method is debt amount * 10%. The minimum repayment amount of 45,000 yuan is 45,000 *10% = 4,500 yuan. When you can't pay the arrears on the billing date, you can choose the minimum repayment amount. However, if only the minimum repayment amount is paid, interest and other payables will be generated.