Hello, I paid 20,000 in installments with my credit card and paid it back in 24 installments, with a profit of 3%. What is the interest rate in 2 years? How much is the monthly repayment? There is a formula for the highest value, thank you!

Interest of 3% refers to a monthly handling fee of 0.3%

The monthly principal is 20,000 divided by 24,833.33 yuan;

The monthly handling fee is 20,000 times 0.3%, which is 60 yuan;

You need to repay 893.33 yuan every month.