The flexible installment fee of Huaxia Bank's credit card needs to be calculated by the formula "installment fee = installment total amount * installment fee rate". At present, the flexible credit card installment of Huaxia Bank is 1, 2, 3, 6, 9, 12, 15, 18, 2 1, 24, 36, of which 1. The handling fee for the 6th, 9th, 12, 15, 18, 2 1, 24th and 36th installments is 0.72%.

Assuming that the number of installments by users is 6 and the installment amount is 800 yuan, it can be calculated that the handling fee for each installment is 800*0.72%=5.76 yuan.