If you pay 1,800 yuan per month on a credit card, how much is its principal?

1800 yuan.

1. Calculate the monthly interest based on the interest rate. Assuming that the interest rate of a credit card is 18%, the monthly interest is: 1,800 yuan x 18% ÷ 12 = 270 yuan

2. Subtract the interest from the monthly repayment amount to get the monthly The principal repayment amount. According to the monthly repayment condition of 1,800 yuan, the monthly principal repayment amount is: 1,800 yuan-270 yuan = 1,530 yuan

3. Based on the monthly principal repayment amount, it can be calculated The principal amount of the credit card. If it is assumed that the principal of the credit card is X yuan, then: X yuan × 18% ÷ 12 = 270 yuan. Solving the equation can be obtained:

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