How to calculate interest by credit card installment! The interest handling fee is 0.56! If you spend 200 thousand 36 installments, how much will it cost every month! How much is it altogether! Do you understand? Credit card installment requires a monthly handling fee and no interest. So the 0.56% handling fee is 200,000 * 0.0056 =1120 yuan. The monthly repayment of 200000/36+ 1 120 is about 6675.56 yuan. Total handling fee 1 120*36=40320 yuan. A total of 240,000 320 yuan was repaid.